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Finding the Fourth Proportional to 977.10, 1,348.31 and 557.55

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Solution

The fourth proportional to 977.10, 1,348.31 and 557.55 is: 769.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.10 : 1,348.31 = 557.55 : x
  2. Step 2: Convert to fraction form
    977.10/1,348.31 = 557.55/x
  3. Step 3: Cross multiply
    977.10x = 1,348.31 × 557.55
  4. Step 4: Simplify right side
    977.10x = 751,747.45
  5. Step 5: Solve for x
    x = 751,747.45/977.10
  6. Step 6: Final answer
    x = 769.37

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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.