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Finding the Fourth Proportional to 1,005.38, 1,387.48 and 563.30

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Solution

The fourth proportional to 1,005.38, 1,387.48 and 563.30 is: 777.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.38 : 1,387.48 = 563.30 : x
  2. Step 2: Convert to fraction form
    1,005.38/1,387.48 = 563.30/x
  3. Step 3: Cross multiply
    1,005.38x = 1,387.48 × 563.30
  4. Step 4: Simplify right side
    1,005.38x = 781,573.20
  5. Step 5: Solve for x
    x = 781,573.20/1,005.38
  6. Step 6: Final answer
    x = 777.39

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1.5x scale

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.