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Finding the Fourth Proportional to 1,042.55, 1,564.05 and 393.29

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Solution

The fourth proportional to 1,042.55, 1,564.05 and 393.29 is: 590.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.55 : 1,564.05 = 393.29 : x
  2. Step 2: Convert to fraction form
    1,042.55/1,564.05 = 393.29/x
  3. Step 3: Cross multiply
    1,042.55x = 1,564.05 × 393.29
  4. Step 4: Simplify right side
    1,042.55x = 615,123.26
  5. Step 5: Solve for x
    x = 615,123.26/1,042.55
  6. Step 6: Final answer
    x = 590.02

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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.