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Finding the Fourth Proportional to 10,979.20, 16,436.40 and 10,338.40

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Solution

The fourth proportional to 10,979.20, 16,436.40 and 10,338.40 is: 15,477.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,979.20 : 16,436.40 = 10,338.40 : x
  2. Step 2: Convert to fraction form
    10,979.20/16,436.40 = 10,338.40/x
  3. Step 3: Cross multiply
    10,979.20x = 16,436.40 × 10,338.40
  4. Step 4: Simplify right side
    10,979.20x = 169,926,077.76
  5. Step 5: Solve for x
    x = 169,926,077.76/10,979.20
  6. Step 6: Final answer
    x = 15,477.09

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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.