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Finding the Fourth Proportional to 711.30, 981.78 and 637.49

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Solution

The fourth proportional to 711.30, 981.78 and 637.49 is: 879.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.30 : 981.78 = 637.49 : x
  2. Step 2: Convert to fraction form
    711.30/981.78 = 637.49/x
  3. Step 3: Cross multiply
    711.30x = 981.78 × 637.49
  4. Step 4: Simplify right side
    711.30x = 625,870.02
  5. Step 5: Solve for x
    x = 625,870.02/711.30
  6. Step 6: Final answer
    x = 879.90

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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.