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Finding the Fourth Proportional to 987.54, 1,481.00 and 440.21

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Solution

The fourth proportional to 987.54, 1,481.00 and 440.21 is: 660.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.54 : 1,481.00 = 440.21 : x
  2. Step 2: Convert to fraction form
    987.54/1,481.00 = 440.21/x
  3. Step 3: Cross multiply
    987.54x = 1,481.00 × 440.21
  4. Step 4: Simplify right side
    987.54x = 651,941.40
  5. Step 5: Solve for x
    x = 651,941.40/987.54
  6. Step 6: Final answer
    x = 660.17

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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.