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Finding the Fourth Proportional to 9,170.87, 12,655.80 and 4,979.12

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Solution

The fourth proportional to 9,170.87, 12,655.80 and 4,979.12 is: 6,871.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,170.87 : 12,655.80 = 4,979.12 : x
  2. Step 2: Convert to fraction form
    9,170.87/12,655.80 = 4,979.12/x
  3. Step 3: Cross multiply
    9,170.87x = 12,655.80 × 4,979.12
  4. Step 4: Simplify right side
    9,170.87x = 63,014,746.90
  5. Step 5: Solve for x
    x = 63,014,746.90/9,170.87
  6. Step 6: Final answer
    x = 6,871.19

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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.