Home / 20,578.18-28,397.86-11,146.74

Finding the Fourth Proportional to 20,578.18, 28,397.86 and 11,146.74

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Solution

The fourth proportional to 20,578.18, 28,397.86 and 11,146.74 is: 15,382.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,578.18 : 28,397.86 = 11,146.74 : x
  2. Step 2: Convert to fraction form
    20,578.18/28,397.86 = 11,146.74/x
  3. Step 3: Cross multiply
    20,578.18x = 28,397.86 × 11,146.74
  4. Step 4: Simplify right side
    20,578.18x = 316,543,534.11
  5. Step 5: Solve for x
    x = 316,543,534.11/20,578.18
  6. Step 6: Final answer
    x = 15,382.49

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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.