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Finding the Fourth Proportional to 1,008.13, 1,388.03 and 915.85

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Solution

The fourth proportional to 1,008.13, 1,388.03 and 915.85 is: 1,260.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.13 : 1,388.03 = 915.85 : x
  2. Step 2: Convert to fraction form
    1,008.13/1,388.03 = 915.85/x
  3. Step 3: Cross multiply
    1,008.13x = 1,388.03 × 915.85
  4. Step 4: Simplify right side
    1,008.13x = 1,271,227.28
  5. Step 5: Solve for x
    x = 1,271,227.28/1,008.13
  6. Step 6: Final answer
    x = 1,260.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.