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Finding the Fourth Proportional to 987.90, 1,479.57 and 576.32

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Solution

The fourth proportional to 987.90, 1,479.57 and 576.32 is: 863.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.90 : 1,479.57 = 576.32 : x
  2. Step 2: Convert to fraction form
    987.90/1,479.57 = 576.32/x
  3. Step 3: Cross multiply
    987.90x = 1,479.57 × 576.32
  4. Step 4: Simplify right side
    987.90x = 852,696.22
  5. Step 5: Solve for x
    x = 852,696.22/987.90
  6. Step 6: Final answer
    x = 863.14

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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.