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Finding the Fourth Proportional to 987.86, 1,481.79 and 474.50

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Solution

The fourth proportional to 987.86, 1,481.79 and 474.50 is: 711.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.86 : 1,481.79 = 474.50 : x
  2. Step 2: Convert to fraction form
    987.86/1,481.79 = 474.50/x
  3. Step 3: Cross multiply
    987.86x = 1,481.79 × 474.50
  4. Step 4: Simplify right side
    987.86x = 703,109.36
  5. Step 5: Solve for x
    x = 703,109.36/987.86
  6. Step 6: Final answer
    x = 711.75

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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.