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Finding the Fourth Proportional to 1,005.29, 1,387.30 and 563.20

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Solution

The fourth proportional to 1,005.29, 1,387.30 and 563.20 is: 777.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.29 : 1,387.30 = 563.20 : x
  2. Step 2: Convert to fraction form
    1,005.29/1,387.30 = 563.20/x
  3. Step 3: Cross multiply
    1,005.29x = 1,387.30 × 563.20
  4. Step 4: Simplify right side
    1,005.29x = 781,332.93
  5. Step 5: Solve for x
    x = 781,332.93/1,005.29
  6. Step 6: Final answer
    x = 777.22

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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.