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Finding the Fourth Proportional to 977.47, 1,348.94 and 557.89

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Solution

The fourth proportional to 977.47, 1,348.94 and 557.89 is: 769.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.47 : 1,348.94 = 557.89 : x
  2. Step 2: Convert to fraction form
    977.47/1,348.94 = 557.89/x
  3. Step 3: Cross multiply
    977.47x = 1,348.94 × 557.89
  4. Step 4: Simplify right side
    977.47x = 752,560.14
  5. Step 5: Solve for x
    x = 752,560.14/977.47
  6. Step 6: Final answer
    x = 769.91

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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.