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Finding the Fourth Proportional to 932.42, 1,390.28 and 906.90

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Solution

The fourth proportional to 932.42, 1,390.28 and 906.90 is: 1,352.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.42 : 1,390.28 = 906.90 : x
  2. Step 2: Convert to fraction form
    932.42/1,390.28 = 906.90/x
  3. Step 3: Cross multiply
    932.42x = 1,390.28 × 906.90
  4. Step 4: Simplify right side
    932.42x = 1,260,844.93
  5. Step 5: Solve for x
    x = 1,260,844.93/932.42
  6. Step 6: Final answer
    x = 1,352.23

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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.