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Finding the Fourth Proportional to 21,918.62, 32,879.74 and 7,127.20

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Solution

The fourth proportional to 21,918.62, 32,879.74 and 7,127.20 is: 10,691.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.62 : 32,879.74 = 7,127.20 : x
  2. Step 2: Convert to fraction form
    21,918.62/32,879.74 = 7,127.20/x
  3. Step 3: Cross multiply
    21,918.62x = 32,879.74 × 7,127.20
  4. Step 4: Simplify right side
    21,918.62x = 234,340,482.93
  5. Step 5: Solve for x
    x = 234,340,482.93/21,918.62
  6. Step 6: Final answer
    x = 10,691.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.