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Finding the Fourth Proportional to 19,891.47, 29,891.91 and 18,591.12

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Solution

The fourth proportional to 19,891.47, 29,891.91 and 18,591.12 is: 27,937.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,891.47 : 29,891.91 = 18,591.12 : x
  2. Step 2: Convert to fraction form
    19,891.47/29,891.91 = 18,591.12/x
  3. Step 3: Cross multiply
    19,891.47x = 29,891.91 × 18,591.12
  4. Step 4: Simplify right side
    19,891.47x = 555,724,085.84
  5. Step 5: Solve for x
    x = 555,724,085.84/19,891.47
  6. Step 6: Final answer
    x = 27,937.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.