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Finding the Fourth Proportional to 10,855.20, 14,979.36 and 7,323.20

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Solution

The fourth proportional to 10,855.20, 14,979.36 and 7,323.20 is: 10,105.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,855.20 : 14,979.36 = 7,323.20 : x
  2. Step 2: Convert to fraction form
    10,855.20/14,979.36 = 7,323.20/x
  3. Step 3: Cross multiply
    10,855.20x = 14,979.36 × 7,323.20
  4. Step 4: Simplify right side
    10,855.20x = 109,696,849.15
  5. Step 5: Solve for x
    x = 109,696,849.15/10,855.20
  6. Step 6: Final answer
    x = 10,105.47

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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.