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Finding the Fourth Proportional to 1,237.71, 1,709.82 and 988.70

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Solution

The fourth proportional to 1,237.71, 1,709.82 and 988.70 is: 1,365.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.71 : 1,709.82 = 988.70 : x
  2. Step 2: Convert to fraction form
    1,237.71/1,709.82 = 988.70/x
  3. Step 3: Cross multiply
    1,237.71x = 1,709.82 × 988.70
  4. Step 4: Simplify right side
    1,237.71x = 1,690,490.48
  5. Step 5: Solve for x
    x = 1,690,490.48/1,237.71
  6. Step 6: Final answer
    x = 1,365.82

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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.