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Finding the Fourth Proportional to 7,108.80, 9,814.80 and 4,869.90

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Solution

The fourth proportional to 7,108.80, 9,814.80 and 4,869.90 is: 6,723.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,108.80 : 9,814.80 = 4,869.90 : x
  2. Step 2: Convert to fraction form
    7,108.80/9,814.80 = 4,869.90/x
  3. Step 3: Cross multiply
    7,108.80x = 9,814.80 × 4,869.90
  4. Step 4: Simplify right side
    7,108.80x = 47,797,094.52
  5. Step 5: Solve for x
    x = 47,797,094.52/7,108.80
  6. Step 6: Final answer
    x = 6,723.65

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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.