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Finding the Fourth Proportional to 12,882.86, 17,779.38 and 7,218.87

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Solution

The fourth proportional to 12,882.86, 17,779.38 and 7,218.87 is: 9,962.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,882.86 : 17,779.38 = 7,218.87 : x
  2. Step 2: Convert to fraction form
    12,882.86/17,779.38 = 7,218.87/x
  3. Step 3: Cross multiply
    12,882.86x = 17,779.38 × 7,218.87
  4. Step 4: Simplify right side
    12,882.86x = 128,347,032.90
  5. Step 5: Solve for x
    x = 128,347,032.90/12,882.86
  6. Step 6: Final answer
    x = 9,962.62

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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.