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Finding the Fourth Proportional to 987.10, 1,479.30 and 498.94

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Solution

The fourth proportional to 987.10, 1,479.30 and 498.94 is: 747.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.10 : 1,479.30 = 498.94 : x
  2. Step 2: Convert to fraction form
    987.10/1,479.30 = 498.94/x
  3. Step 3: Cross multiply
    987.10x = 1,479.30 × 498.94
  4. Step 4: Simplify right side
    987.10x = 738,081.94
  5. Step 5: Solve for x
    x = 738,081.94/987.10
  6. Step 6: Final answer
    x = 747.73

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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.