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Finding the Fourth Proportional to 1,737.99, 2,398.57 and 991.78

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Solution

The fourth proportional to 1,737.99, 2,398.57 and 991.78 is: 1,368.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,737.99 : 2,398.57 = 991.78 : x
  2. Step 2: Convert to fraction form
    1,737.99/2,398.57 = 991.78/x
  3. Step 3: Cross multiply
    1,737.99x = 2,398.57 × 991.78
  4. Step 4: Simplify right side
    1,737.99x = 2,378,853.75
  5. Step 5: Solve for x
    x = 2,378,853.75/1,737.99
  6. Step 6: Final answer
    x = 1,368.74

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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.