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Finding the Fourth Proportional to 12,643.20, 18,979.20 and 5,253.12

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Solution

The fourth proportional to 12,643.20, 18,979.20 and 5,253.12 is: 7,885.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,643.20 : 18,979.20 = 5,253.12 : x
  2. Step 2: Convert to fraction form
    12,643.20/18,979.20 = 5,253.12/x
  3. Step 3: Cross multiply
    12,643.20x = 18,979.20 × 5,253.12
  4. Step 4: Simplify right side
    12,643.20x = 99,700,015.10
  5. Step 5: Solve for x
    x = 99,700,015.10/12,643.20
  6. Step 6: Final answer
    x = 7,885.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.