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Finding the Fourth Proportional to 915.96, 1,373.64 and 780.48

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Solution

The fourth proportional to 915.96, 1,373.64 and 780.48 is: 1,170.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.96 : 1,373.64 = 780.48 : x
  2. Step 2: Convert to fraction form
    915.96/1,373.64 = 780.48/x
  3. Step 3: Cross multiply
    915.96x = 1,373.64 × 780.48
  4. Step 4: Simplify right side
    915.96x = 1,072,098.55
  5. Step 5: Solve for x
    x = 1,072,098.55/915.96
  6. Step 6: Final answer
    x = 1,170.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.