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Finding the Fourth Proportional to 1,432.80, 1,976.94 and 991.62

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Solution

The fourth proportional to 1,432.80, 1,976.94 and 991.62 is: 1,368.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.80 : 1,976.94 = 991.62 : x
  2. Step 2: Convert to fraction form
    1,432.80/1,976.94 = 991.62/x
  3. Step 3: Cross multiply
    1,432.80x = 1,976.94 × 991.62
  4. Step 4: Simplify right side
    1,432.80x = 1,960,373.24
  5. Step 5: Solve for x
    x = 1,960,373.24/1,432.80
  6. Step 6: Final answer
    x = 1,368.21

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1.5x scale

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.