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Finding the Fourth Proportional to 915.35, 1,260.64 and 790.97

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Solution

The fourth proportional to 915.35, 1,260.64 and 790.97 is: 1,089.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.35 : 1,260.64 = 790.97 : x
  2. Step 2: Convert to fraction form
    915.35/1,260.64 = 790.97/x
  3. Step 3: Cross multiply
    915.35x = 1,260.64 × 790.97
  4. Step 4: Simplify right side
    915.35x = 997,120.88
  5. Step 5: Solve for x
    x = 997,120.88/915.35
  6. Step 6: Final answer
    x = 1,089.33

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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.