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Finding the Fourth Proportional to 987.50, 1,481.12 and 257.02

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Solution

The fourth proportional to 987.50, 1,481.12 and 257.02 is: 385.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.50 : 1,481.12 = 257.02 : x
  2. Step 2: Convert to fraction form
    987.50/1,481.12 = 257.02/x
  3. Step 3: Cross multiply
    987.50x = 1,481.12 × 257.02
  4. Step 4: Simplify right side
    987.50x = 380,668.77
  5. Step 5: Solve for x
    x = 380,668.77/987.50
  6. Step 6: Final answer
    x = 385.49

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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.