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Finding the Fourth Proportional to 872.14, 1,307.10 and 408.90

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Solution

The fourth proportional to 872.14, 1,307.10 and 408.90 is: 612.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.14 : 1,307.10 = 408.90 : x
  2. Step 2: Convert to fraction form
    872.14/1,307.10 = 408.90/x
  3. Step 3: Cross multiply
    872.14x = 1,307.10 × 408.90
  4. Step 4: Simplify right side
    872.14x = 534,466.76
  5. Step 5: Solve for x
    x = 534,466.76/872.14
  6. Step 6: Final answer
    x = 612.82

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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.