Home / 15,841.38-21,890-15,072.78

Finding the Fourth Proportional to 15,841.38, 21,890 and 15,072.78

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Solution

The fourth proportional to 15,841.38, 21,890 and 15,072.78 is: 20,827.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,841.38 : 21,890 = 15,072.78 : x
  2. Step 2: Convert to fraction form
    15,841.38/21,890 = 15,072.78/x
  3. Step 3: Cross multiply
    15,841.38x = 21,890 × 15,072.78
  4. Step 4: Simplify right side
    15,841.38x = 329,943,154.20
  5. Step 5: Solve for x
    x = 329,943,154.20/15,841.38
  6. Step 6: Final answer
    x = 20,827.93

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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.