Home / 8,979.40-12,390.12-5,000.50

Finding the Fourth Proportional to 8,979.40, 12,390.12 and 5,000.50

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Solution

The fourth proportional to 8,979.40, 12,390.12 and 5,000.50 is: 6,899.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.40 : 12,390.12 = 5,000.50 : x
  2. Step 2: Convert to fraction form
    8,979.40/12,390.12 = 5,000.50/x
  3. Step 3: Cross multiply
    8,979.40x = 12,390.12 × 5,000.50
  4. Step 4: Simplify right side
    8,979.40x = 61,956,795.06
  5. Step 5: Solve for x
    x = 61,956,795.06/8,979.40
  6. Step 6: Final answer
    x = 6,899.88

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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.