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Finding the Fourth Proportional to 1,220.68, 1,830.75 and 480.34

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Solution

The fourth proportional to 1,220.68, 1,830.75 and 480.34 is: 720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.68 : 1,830.75 = 480.34 : x
  2. Step 2: Convert to fraction form
    1,220.68/1,830.75 = 480.34/x
  3. Step 3: Cross multiply
    1,220.68x = 1,830.75 × 480.34
  4. Step 4: Simplify right side
    1,220.68x = 879,382.46
  5. Step 5: Solve for x
    x = 879,382.46/1,220.68
  6. Step 6: Final answer
    x = 720.40

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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.