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Finding the Fourth Proportional to 1,487.40, 2,230.78 and 461.40

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Solution

The fourth proportional to 1,487.40, 2,230.78 and 461.40 is: 692.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.40 : 2,230.78 = 461.40 : x
  2. Step 2: Convert to fraction form
    1,487.40/2,230.78 = 461.40/x
  3. Step 3: Cross multiply
    1,487.40x = 2,230.78 × 461.40
  4. Step 4: Simplify right side
    1,487.40x = 1,029,281.89
  5. Step 5: Solve for x
    x = 1,029,281.89/1,487.40
  6. Step 6: Final answer
    x = 692.00

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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.