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Finding the Fourth Proportional to 915.66, 1,255.37 and 899.28

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Solution

The fourth proportional to 915.66, 1,255.37 and 899.28 is: 1,232.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.66 : 1,255.37 = 899.28 : x
  2. Step 2: Convert to fraction form
    915.66/1,255.37 = 899.28/x
  3. Step 3: Cross multiply
    915.66x = 1,255.37 × 899.28
  4. Step 4: Simplify right side
    915.66x = 1,128,924.64
  5. Step 5: Solve for x
    x = 1,128,924.64/915.66
  6. Step 6: Final answer
    x = 1,232.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.