Home / 11,561.48-15,948.70-7,778.20

Finding the Fourth Proportional to 11,561.48, 15,948.70 and 7,778.20

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Solution

The fourth proportional to 11,561.48, 15,948.70 and 7,778.20 is: 10,729.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,561.48 : 15,948.70 = 7,778.20 : x
  2. Step 2: Convert to fraction form
    11,561.48/15,948.70 = 7,778.20/x
  3. Step 3: Cross multiply
    11,561.48x = 15,948.70 × 7,778.20
  4. Step 4: Simplify right side
    11,561.48x = 124,052,193.78
  5. Step 5: Solve for x
    x = 124,052,193.78/11,561.48
  6. Step 6: Final answer
    x = 10,729.78

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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.