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Finding the Fourth Proportional to 1,247.96, 1,721.87 and 915.81

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Solution

The fourth proportional to 1,247.96, 1,721.87 and 915.81 is: 1,263.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.96 : 1,721.87 = 915.81 : x
  2. Step 2: Convert to fraction form
    1,247.96/1,721.87 = 915.81/x
  3. Step 3: Cross multiply
    1,247.96x = 1,721.87 × 915.81
  4. Step 4: Simplify right side
    1,247.96x = 1,576,904.62
  5. Step 5: Solve for x
    x = 1,576,904.62/1,247.96
  6. Step 6: Final answer
    x = 1,263.58

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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.