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Finding the Fourth Proportional to 7,479.80, 11,172.55 and 7,272.44

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Solution

The fourth proportional to 7,479.80, 11,172.55 and 7,272.44 is: 10,862.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,479.80 : 11,172.55 = 7,272.44 : x
  2. Step 2: Convert to fraction form
    7,479.80/11,172.55 = 7,272.44/x
  3. Step 3: Cross multiply
    7,479.80x = 11,172.55 × 7,272.44
  4. Step 4: Simplify right side
    7,479.80x = 81,251,699.52
  5. Step 5: Solve for x
    x = 81,251,699.52/7,479.80
  6. Step 6: Final answer
    x = 10,862.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.