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Finding the Fourth Proportional to 936.64, 1,402.08 and 781.12

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Solution

The fourth proportional to 936.64, 1,402.08 and 781.12 is: 1,169.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.64 : 1,402.08 = 781.12 : x
  2. Step 2: Convert to fraction form
    936.64/1,402.08 = 781.12/x
  3. Step 3: Cross multiply
    936.64x = 1,402.08 × 781.12
  4. Step 4: Simplify right side
    936.64x = 1,095,192.73
  5. Step 5: Solve for x
    x = 1,095,192.73/936.64
  6. Step 6: Final answer
    x = 1,169.28

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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.