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Finding the Fourth Proportional to 1,175.26, 1,621.64 and 915.24

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Solution

The fourth proportional to 1,175.26, 1,621.64 and 915.24 is: 1,262.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.26 : 1,621.64 = 915.24 : x
  2. Step 2: Convert to fraction form
    1,175.26/1,621.64 = 915.24/x
  3. Step 3: Cross multiply
    1,175.26x = 1,621.64 × 915.24
  4. Step 4: Simplify right side
    1,175.26x = 1,484,189.79
  5. Step 5: Solve for x
    x = 1,484,189.79/1,175.26
  6. Step 6: Final answer
    x = 1,262.86

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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.