Home / 15,780.56-21,777.40-8,706.84

Finding the Fourth Proportional to 15,780.56, 21,777.40 and 8,706.84

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Solution

The fourth proportional to 15,780.56, 21,777.40 and 8,706.84 is: 12,015.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.56 : 21,777.40 = 8,706.84 : x
  2. Step 2: Convert to fraction form
    15,780.56/21,777.40 = 8,706.84/x
  3. Step 3: Cross multiply
    15,780.56x = 21,777.40 × 8,706.84
  4. Step 4: Simplify right side
    15,780.56x = 189,612,337.42
  5. Step 5: Solve for x
    x = 189,612,337.42/15,780.56
  6. Step 6: Final answer
    x = 12,015.56

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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.