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Finding the Fourth Proportional to 915.80, 1,373.99 and 779.10

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Solution

The fourth proportional to 915.80, 1,373.99 and 779.10 is: 1,168.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.80 : 1,373.99 = 779.10 : x
  2. Step 2: Convert to fraction form
    915.80/1,373.99 = 779.10/x
  3. Step 3: Cross multiply
    915.80x = 1,373.99 × 779.10
  4. Step 4: Simplify right side
    915.80x = 1,070,471.71
  5. Step 5: Solve for x
    x = 1,070,471.71/915.80
  6. Step 6: Final answer
    x = 1,168.90

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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.