Home / 15,781.88-21,779.70-9,069.68

Finding the Fourth Proportional to 15,781.88, 21,779.70 and 9,069.68

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Solution

The fourth proportional to 15,781.88, 21,779.70 and 9,069.68 is: 12,516.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.88 : 21,779.70 = 9,069.68 : x
  2. Step 2: Convert to fraction form
    15,781.88/21,779.70 = 9,069.68/x
  3. Step 3: Cross multiply
    15,781.88x = 21,779.70 × 9,069.68
  4. Step 4: Simplify right side
    15,781.88x = 197,534,909.50
  5. Step 5: Solve for x
    x = 197,534,909.50/15,781.88
  6. Step 6: Final answer
    x = 12,516.56

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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.