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Finding the Fourth Proportional to 9,405.76, 12,979.18 and 5,156.74

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Solution

The fourth proportional to 9,405.76, 12,979.18 and 5,156.74 is: 7,115.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,405.76 : 12,979.18 = 5,156.74 : x
  2. Step 2: Convert to fraction form
    9,405.76/12,979.18 = 5,156.74/x
  3. Step 3: Cross multiply
    9,405.76x = 12,979.18 × 5,156.74
  4. Step 4: Simplify right side
    9,405.76x = 66,930,256.67
  5. Step 5: Solve for x
    x = 66,930,256.67/9,405.76
  6. Step 6: Final answer
    x = 7,115.88

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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.