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Finding the Fourth Proportional to 1,315.68, 1,972.20 and 853.76

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Solution

The fourth proportional to 1,315.68, 1,972.20 and 853.76 is: 1,279.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.68 : 1,972.20 = 853.76 : x
  2. Step 2: Convert to fraction form
    1,315.68/1,972.20 = 853.76/x
  3. Step 3: Cross multiply
    1,315.68x = 1,972.20 × 853.76
  4. Step 4: Simplify right side
    1,315.68x = 1,683,785.47
  5. Step 5: Solve for x
    x = 1,683,785.47/1,315.68
  6. Step 6: Final answer
    x = 1,279.78

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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.