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Finding the Fourth Proportional to 932.18, 1,284.55 and 665.87

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Solution

The fourth proportional to 932.18, 1,284.55 and 665.87 is: 917.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.18 : 1,284.55 = 665.87 : x
  2. Step 2: Convert to fraction form
    932.18/1,284.55 = 665.87/x
  3. Step 3: Cross multiply
    932.18x = 1,284.55 × 665.87
  4. Step 4: Simplify right side
    932.18x = 855,335.22
  5. Step 5: Solve for x
    x = 855,335.22/932.18
  6. Step 6: Final answer
    x = 917.57

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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.