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Finding the Fourth Proportional to 932.18, 1,390.13 and 817.16

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Solution

The fourth proportional to 932.18, 1,390.13 and 817.16 is: 1,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.18 : 1,390.13 = 817.16 : x
  2. Step 2: Convert to fraction form
    932.18/1,390.13 = 817.16/x
  3. Step 3: Cross multiply
    932.18x = 1,390.13 × 817.16
  4. Step 4: Simplify right side
    932.18x = 1,135,958.63
  5. Step 5: Solve for x
    x = 1,135,958.63/932.18
  6. Step 6: Final answer
    x = 1,218.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.