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Finding the Fourth Proportional to 987.59, 1,479.97 and 617.22

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Solution

The fourth proportional to 987.59, 1,479.97 and 617.22 is: 924.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.59 : 1,479.97 = 617.22 : x
  2. Step 2: Convert to fraction form
    987.59/1,479.97 = 617.22/x
  3. Step 3: Cross multiply
    987.59x = 1,479.97 × 617.22
  4. Step 4: Simplify right side
    987.59x = 913,467.85
  5. Step 5: Solve for x
    x = 913,467.85/987.59
  6. Step 6: Final answer
    x = 924.94

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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.