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Finding the Fourth Proportional to 8,979.84, 12,390.80 and 5,000.96

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Solution

The fourth proportional to 8,979.84, 12,390.80 and 5,000.96 is: 6,900.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.84 : 12,390.80 = 5,000.96 : x
  2. Step 2: Convert to fraction form
    8,979.84/12,390.80 = 5,000.96/x
  3. Step 3: Cross multiply
    8,979.84x = 12,390.80 × 5,000.96
  4. Step 4: Simplify right side
    8,979.84x = 61,965,895.17
  5. Step 5: Solve for x
    x = 61,965,895.17/8,979.84
  6. Step 6: Final answer
    x = 6,900.56

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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.