Home / 8,979.30-12,390.74-4,999.64

Finding the Fourth Proportional to 8,979.30, 12,390.74 and 4,999.64

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Solution

The fourth proportional to 8,979.30, 12,390.74 and 4,999.64 is: 6,899.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.30 : 12,390.74 = 4,999.64 : x
  2. Step 2: Convert to fraction form
    8,979.30/12,390.74 = 4,999.64/x
  3. Step 3: Cross multiply
    8,979.30x = 12,390.74 × 4,999.64
  4. Step 4: Simplify right side
    8,979.30x = 61,949,239.33
  5. Step 5: Solve for x
    x = 61,949,239.33/8,979.30
  6. Step 6: Final answer
    x = 6,899.12

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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.