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Finding the Fourth Proportional to 1,434.74, 1,976.87 and 991.87

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Solution

The fourth proportional to 1,434.74, 1,976.87 and 991.87 is: 1,366.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,434.74 : 1,976.87 = 991.87 : x
  2. Step 2: Convert to fraction form
    1,434.74/1,976.87 = 991.87/x
  3. Step 3: Cross multiply
    1,434.74x = 1,976.87 × 991.87
  4. Step 4: Simplify right side
    1,434.74x = 1,960,795.58
  5. Step 5: Solve for x
    x = 1,960,795.58/1,434.74
  6. Step 6: Final answer
    x = 1,366.66

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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.