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Finding the Fourth Proportional to 914.70, 1,372.05 and 813.90

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Solution

The fourth proportional to 914.70, 1,372.05 and 813.90 is: 1,220.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.70 : 1,372.05 = 813.90 : x
  2. Step 2: Convert to fraction form
    914.70/1,372.05 = 813.90/x
  3. Step 3: Cross multiply
    914.70x = 1,372.05 × 813.90
  4. Step 4: Simplify right side
    914.70x = 1,116,711.50
  5. Step 5: Solve for x
    x = 1,116,711.50/914.70
  6. Step 6: Final answer
    x = 1,220.85

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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.