Home / 20,979-28,951.11-11,547.72

Finding the Fourth Proportional to 20,979, 28,951.11 and 11,547.72

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Solution

The fourth proportional to 20,979, 28,951.11 and 11,547.72 is: 15,935.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979 : 28,951.11 = 11,547.72 : x
  2. Step 2: Convert to fraction form
    20,979/28,951.11 = 11,547.72/x
  3. Step 3: Cross multiply
    20,979x = 28,951.11 × 11,547.72
  4. Step 4: Simplify right side
    20,979x = 334,319,311.97
  5. Step 5: Solve for x
    x = 334,319,311.97/20,979
  6. Step 6: Final answer
    x = 15,935.90

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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.