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Finding the Fourth Proportional to 987.88, 1,481.31 and 525.91

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Solution

The fourth proportional to 987.88, 1,481.31 and 525.91 is: 788.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.88 : 1,481.31 = 525.91 : x
  2. Step 2: Convert to fraction form
    987.88/1,481.31 = 525.91/x
  3. Step 3: Cross multiply
    987.88x = 1,481.31 × 525.91
  4. Step 4: Simplify right side
    987.88x = 779,035.74
  5. Step 5: Solve for x
    x = 779,035.74/987.88
  6. Step 6: Final answer
    x = 788.59

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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.