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Finding the Fourth Proportional to 987.71, 1,489.06 and 934.79

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Solution

The fourth proportional to 987.71, 1,489.06 and 934.79 is: 1,409.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.71 : 1,489.06 = 934.79 : x
  2. Step 2: Convert to fraction form
    987.71/1,489.06 = 934.79/x
  3. Step 3: Cross multiply
    987.71x = 1,489.06 × 934.79
  4. Step 4: Simplify right side
    987.71x = 1,391,958.40
  5. Step 5: Solve for x
    x = 1,391,958.40/987.71
  6. Step 6: Final answer
    x = 1,409.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.