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Finding the Fourth Proportional to 934.72, 1,402.09 and 386.61

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Solution

The fourth proportional to 934.72, 1,402.09 and 386.61 is: 579.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.72 : 1,402.09 = 386.61 : x
  2. Step 2: Convert to fraction form
    934.72/1,402.09 = 386.61/x
  3. Step 3: Cross multiply
    934.72x = 1,402.09 × 386.61
  4. Step 4: Simplify right side
    934.72x = 542,053.07
  5. Step 5: Solve for x
    x = 542,053.07/934.72
  6. Step 6: Final answer
    x = 579.91

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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.