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Finding the Fourth Proportional to 1,402.40, 1,930.32 and 987.68

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Solution

The fourth proportional to 1,402.40, 1,930.32 and 987.68 is: 1,359.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.40 : 1,930.32 = 987.68 : x
  2. Step 2: Convert to fraction form
    1,402.40/1,930.32 = 987.68/x
  3. Step 3: Cross multiply
    1,402.40x = 1,930.32 × 987.68
  4. Step 4: Simplify right side
    1,402.40x = 1,906,538.46
  5. Step 5: Solve for x
    x = 1,906,538.46/1,402.40
  6. Step 6: Final answer
    x = 1,359.48

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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.