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Finding the Fourth Proportional to 1,008.90, 1,511.46 and 731.88

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Solution

The fourth proportional to 1,008.90, 1,511.46 and 731.88 is: 1,096.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.90 : 1,511.46 = 731.88 : x
  2. Step 2: Convert to fraction form
    1,008.90/1,511.46 = 731.88/x
  3. Step 3: Cross multiply
    1,008.90x = 1,511.46 × 731.88
  4. Step 4: Simplify right side
    1,008.90x = 1,106,207.34
  5. Step 5: Solve for x
    x = 1,106,207.34/1,008.90
  6. Step 6: Final answer
    x = 1,096.45

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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.