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Finding the Fourth Proportional to 987.36, 1,481.28 and 474.24

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Solution

The fourth proportional to 987.36, 1,481.28 and 474.24 is: 711.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.36 : 1,481.28 = 474.24 : x
  2. Step 2: Convert to fraction form
    987.36/1,481.28 = 474.24/x
  3. Step 3: Cross multiply
    987.36x = 1,481.28 × 474.24
  4. Step 4: Simplify right side
    987.36x = 702,482.23
  5. Step 5: Solve for x
    x = 702,482.23/987.36
  6. Step 6: Final answer
    x = 711.48

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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.