Home / 20,810.38-28,718.40-11,378.92

Finding the Fourth Proportional to 20,810.38, 28,718.40 and 11,378.92

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Solution

The fourth proportional to 20,810.38, 28,718.40 and 11,378.92 is: 15,702.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.38 : 28,718.40 = 11,378.92 : x
  2. Step 2: Convert to fraction form
    20,810.38/28,718.40 = 11,378.92/x
  3. Step 3: Cross multiply
    20,810.38x = 28,718.40 × 11,378.92
  4. Step 4: Simplify right side
    20,810.38x = 326,784,376.13
  5. Step 5: Solve for x
    x = 326,784,376.13/20,810.38
  6. Step 6: Final answer
    x = 15,702.95

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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.