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Finding the Fourth Proportional to 9,129.88, 12,599.80 and 5,149.52

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Solution

The fourth proportional to 9,129.88, 12,599.80 and 5,149.52 is: 7,106.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,129.88 : 12,599.80 = 5,149.52 : x
  2. Step 2: Convert to fraction form
    9,129.88/12,599.80 = 5,149.52/x
  3. Step 3: Cross multiply
    9,129.88x = 12,599.80 × 5,149.52
  4. Step 4: Simplify right side
    9,129.88x = 64,882,922.10
  5. Step 5: Solve for x
    x = 64,882,922.10/9,129.88
  6. Step 6: Final answer
    x = 7,106.66

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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.