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Finding the Fourth Proportional to 1,230.80, 1,847.40 and 615.20

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Solution

The fourth proportional to 1,230.80, 1,847.40 and 615.20 is: 923.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.80 : 1,847.40 = 615.20 : x
  2. Step 2: Convert to fraction form
    1,230.80/1,847.40 = 615.20/x
  3. Step 3: Cross multiply
    1,230.80x = 1,847.40 × 615.20
  4. Step 4: Simplify right side
    1,230.80x = 1,136,520.48
  5. Step 5: Solve for x
    x = 1,136,520.48/1,230.80
  6. Step 6: Final answer
    x = 923.40

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.