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Finding the Fourth Proportional to 977.40, 1,348.80 and 557.76

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Solution

The fourth proportional to 977.40, 1,348.80 and 557.76 is: 769.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.40 : 1,348.80 = 557.76 : x
  2. Step 2: Convert to fraction form
    977.40/1,348.80 = 557.76/x
  3. Step 3: Cross multiply
    977.40x = 1,348.80 × 557.76
  4. Step 4: Simplify right side
    977.40x = 752,309.00
  5. Step 5: Solve for x
    x = 752,309.00/977.40
  6. Step 6: Final answer
    x = 769.70

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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.