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Finding the Fourth Proportional to 1,009.31, 1,513.82 and 392.58

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Solution

The fourth proportional to 1,009.31, 1,513.82 and 392.58 is: 588.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.31 : 1,513.82 = 392.58 : x
  2. Step 2: Convert to fraction form
    1,009.31/1,513.82 = 392.58/x
  3. Step 3: Cross multiply
    1,009.31x = 1,513.82 × 392.58
  4. Step 4: Simplify right side
    1,009.31x = 594,296.44
  5. Step 5: Solve for x
    x = 594,296.44/1,009.31
  6. Step 6: Final answer
    x = 588.82

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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.