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Finding the Fourth Proportional to 1,316.76, 1,972.80 and 622.68

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Solution

The fourth proportional to 1,316.76, 1,972.80 and 622.68 is: 932.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.76 : 1,972.80 = 622.68 : x
  2. Step 2: Convert to fraction form
    1,316.76/1,972.80 = 622.68/x
  3. Step 3: Cross multiply
    1,316.76x = 1,972.80 × 622.68
  4. Step 4: Simplify right side
    1,316.76x = 1,228,423.10
  5. Step 5: Solve for x
    x = 1,228,423.10/1,316.76
  6. Step 6: Final answer
    x = 932.91

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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.