Home / 15,878.84-21,912.75-8,708.78

Finding the Fourth Proportional to 15,878.84, 21,912.75 and 8,708.78

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Solution

The fourth proportional to 15,878.84, 21,912.75 and 8,708.78 is: 12,018.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.84 : 21,912.75 = 8,708.78 : x
  2. Step 2: Convert to fraction form
    15,878.84/21,912.75 = 8,708.78/x
  3. Step 3: Cross multiply
    15,878.84x = 21,912.75 × 8,708.78
  4. Step 4: Simplify right side
    15,878.84x = 190,833,373.73
  5. Step 5: Solve for x
    x = 190,833,373.73/15,878.84
  6. Step 6: Final answer
    x = 12,018.10

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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.