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Finding the Fourth Proportional to 917.12, 1,373.76 and 853.76

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Solution

The fourth proportional to 917.12, 1,373.76 and 853.76 is: 1,278.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.12 : 1,373.76 = 853.76 : x
  2. Step 2: Convert to fraction form
    917.12/1,373.76 = 853.76/x
  3. Step 3: Cross multiply
    917.12x = 1,373.76 × 853.76
  4. Step 4: Simplify right side
    917.12x = 1,172,861.34
  5. Step 5: Solve for x
    x = 1,172,861.34/917.12
  6. Step 6: Final answer
    x = 1,278.85

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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.