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Finding the Fourth Proportional to 8,720.79, 12,034.64 and 4,741.92

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Solution

The fourth proportional to 8,720.79, 12,034.64 and 4,741.92 is: 6,543.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.79 : 12,034.64 = 4,741.92 : x
  2. Step 2: Convert to fraction form
    8,720.79/12,034.64 = 4,741.92/x
  3. Step 3: Cross multiply
    8,720.79x = 12,034.64 × 4,741.92
  4. Step 4: Simplify right side
    8,720.79x = 57,067,276.40
  5. Step 5: Solve for x
    x = 57,067,276.40/8,720.79
  6. Step 6: Final answer
    x = 6,543.82

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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.