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Finding the Fourth Proportional to 977.34, 1,348.67 and 557.70

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Solution

The fourth proportional to 977.34, 1,348.67 and 557.70 is: 769.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.34 : 1,348.67 = 557.70 : x
  2. Step 2: Convert to fraction form
    977.34/1,348.67 = 557.70/x
  3. Step 3: Cross multiply
    977.34x = 1,348.67 × 557.70
  4. Step 4: Simplify right side
    977.34x = 752,150.47
  5. Step 5: Solve for x
    x = 752,150.47/977.34
  6. Step 6: Final answer
    x = 769.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.