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Finding the Fourth Proportional to 766.25, 1,057.28 and 430.13

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Solution

The fourth proportional to 766.25, 1,057.28 and 430.13 is: 593.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.25 : 1,057.28 = 430.13 : x
  2. Step 2: Convert to fraction form
    766.25/1,057.28 = 430.13/x
  3. Step 3: Cross multiply
    766.25x = 1,057.28 × 430.13
  4. Step 4: Simplify right side
    766.25x = 454,767.85
  5. Step 5: Solve for x
    x = 454,767.85/766.25
  6. Step 6: Final answer
    x = 593.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.