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Finding the Fourth Proportional to 8,904.16, 12,290.34 and 5,129.20

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Solution

The fourth proportional to 8,904.16, 12,290.34 and 5,129.20 is: 7,079.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,904.16 : 12,290.34 = 5,129.20 : x
  2. Step 2: Convert to fraction form
    8,904.16/12,290.34 = 5,129.20/x
  3. Step 3: Cross multiply
    8,904.16x = 12,290.34 × 5,129.20
  4. Step 4: Simplify right side
    8,904.16x = 63,039,611.93
  5. Step 5: Solve for x
    x = 63,039,611.93/8,904.16
  6. Step 6: Final answer
    x = 7,079.79

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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.