Home / 15,848.56-21,871.35-8,678.78

Finding the Fourth Proportional to 15,848.56, 21,871.35 and 8,678.78

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Solution

The fourth proportional to 15,848.56, 21,871.35 and 8,678.78 is: 11,976.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,848.56 : 21,871.35 = 8,678.78 : x
  2. Step 2: Convert to fraction form
    15,848.56/21,871.35 = 8,678.78/x
  3. Step 3: Cross multiply
    15,848.56x = 21,871.35 × 8,678.78
  4. Step 4: Simplify right side
    15,848.56x = 189,816,607.61
  5. Step 5: Solve for x
    x = 189,816,607.61/15,848.56
  6. Step 6: Final answer
    x = 11,976.90

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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.