Home / 39,990.59-55,186.14-21,840.71

Finding the Fourth Proportional to 39,990.59, 55,186.14 and 21,840.71

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Solution

The fourth proportional to 39,990.59, 55,186.14 and 21,840.71 is: 30,139.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,990.59 : 55,186.14 = 21,840.71 : x
  2. Step 2: Convert to fraction form
    39,990.59/55,186.14 = 21,840.71/x
  3. Step 3: Cross multiply
    39,990.59x = 55,186.14 × 21,840.71
  4. Step 4: Simplify right side
    39,990.59x = 1,205,304,479.76
  5. Step 5: Solve for x
    x = 1,205,304,479.76/39,990.59
  6. Step 6: Final answer
    x = 30,139.70

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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.