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Finding the Fourth Proportional to 987.68, 1,480.48 and 329.38

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Solution

The fourth proportional to 987.68, 1,480.48 and 329.38 is: 493.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.68 : 1,480.48 = 329.38 : x
  2. Step 2: Convert to fraction form
    987.68/1,480.48 = 329.38/x
  3. Step 3: Cross multiply
    987.68x = 1,480.48 × 329.38
  4. Step 4: Simplify right side
    987.68x = 487,640.50
  5. Step 5: Solve for x
    x = 487,640.50/987.68
  6. Step 6: Final answer
    x = 493.72

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Double scale
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1.5x scale

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.