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Finding the Fourth Proportional to 10,653.20, 15,979.80 and 8,061.20

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Solution

The fourth proportional to 10,653.20, 15,979.80 and 8,061.20 is: 12,091.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,653.20 : 15,979.80 = 8,061.20 : x
  2. Step 2: Convert to fraction form
    10,653.20/15,979.80 = 8,061.20/x
  3. Step 3: Cross multiply
    10,653.20x = 15,979.80 × 8,061.20
  4. Step 4: Simplify right side
    10,653.20x = 128,816,363.76
  5. Step 5: Solve for x
    x = 128,816,363.76/10,653.20
  6. Step 6: Final answer
    x = 12,091.80

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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.