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Finding the Fourth Proportional to 12,478,693.20, 18,690,046.20 and 10,239,205.20

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Solution

The fourth proportional to 12,478,693.20, 18,690,046.20 and 10,239,205.20 is: 15,335,838.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478,693.20 : 18,690,046.20 = 10,239,205.20 : x
  2. Step 2: Convert to fraction form
    12,478,693.20/18,690,046.20 = 10,239,205.20/x
  3. Step 3: Cross multiply
    12,478,693.20x = 18,690,046.20 × 10,239,205.20
  4. Step 4: Simplify right side
    12,478,693.20x = 191,371,218,239,280.22
  5. Step 5: Solve for x
    x = 191,371,218,239,280.22/12,478,693.20
  6. Step 6: Final answer
    x = 15,335,838.07

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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.