Home / 15,780.42-21,777.09-8,706.87

Finding the Fourth Proportional to 15,780.42, 21,777.09 and 8,706.87

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Solution

The fourth proportional to 15,780.42, 21,777.09 and 8,706.87 is: 12,015.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.42 : 21,777.09 = 8,706.87 : x
  2. Step 2: Convert to fraction form
    15,780.42/21,777.09 = 8,706.87/x
  3. Step 3: Cross multiply
    15,780.42x = 21,777.09 × 8,706.87
  4. Step 4: Simplify right side
    15,780.42x = 189,610,291.61
  5. Step 5: Solve for x
    x = 189,610,291.61/15,780.42
  6. Step 6: Final answer
    x = 12,015.54

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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.