Home / 15,780.96-21,778.80-9,156.96

Finding the Fourth Proportional to 15,780.96, 21,778.80 and 9,156.96

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Solution

The fourth proportional to 15,780.96, 21,778.80 and 9,156.96 is: 12,637.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.96 : 21,778.80 = 9,156.96 : x
  2. Step 2: Convert to fraction form
    15,780.96/21,778.80 = 9,156.96/x
  3. Step 3: Cross multiply
    15,780.96x = 21,778.80 × 9,156.96
  4. Step 4: Simplify right side
    15,780.96x = 199,427,600.45
  5. Step 5: Solve for x
    x = 199,427,600.45/15,780.96
  6. Step 6: Final answer
    x = 12,637.23

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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.