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Finding the Fourth Proportional to 1,071.66, 1,480.53 and 915.90

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Solution

The fourth proportional to 1,071.66, 1,480.53 and 915.90 is: 1,265.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.66 : 1,480.53 = 915.90 : x
  2. Step 2: Convert to fraction form
    1,071.66/1,480.53 = 915.90/x
  3. Step 3: Cross multiply
    1,071.66x = 1,480.53 × 915.90
  4. Step 4: Simplify right side
    1,071.66x = 1,356,012.85
  5. Step 5: Solve for x
    x = 1,356,012.85/1,071.66
  6. Step 6: Final answer
    x = 1,265.34

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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.