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Finding the Fourth Proportional to 987.71, 1,480.52 and 371.15

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Solution

The fourth proportional to 987.71, 1,480.52 and 371.15 is: 556.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.71 : 1,480.52 = 371.15 : x
  2. Step 2: Convert to fraction form
    987.71/1,480.52 = 371.15/x
  3. Step 3: Cross multiply
    987.71x = 1,480.52 × 371.15
  4. Step 4: Simplify right side
    987.71x = 549,485.74
  5. Step 5: Solve for x
    x = 549,485.74/987.71
  6. Step 6: Final answer
    x = 556.33

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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.