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Finding the Fourth Proportional to 915.20, 1,362.46 and 909.80

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Solution

The fourth proportional to 915.20, 1,362.46 and 909.80 is: 1,354.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.20 : 1,362.46 = 909.80 : x
  2. Step 2: Convert to fraction form
    915.20/1,362.46 = 909.80/x
  3. Step 3: Cross multiply
    915.20x = 1,362.46 × 909.80
  4. Step 4: Simplify right side
    915.20x = 1,239,566.11
  5. Step 5: Solve for x
    x = 1,239,566.11/915.20
  6. Step 6: Final answer
    x = 1,354.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.