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Finding the Fourth Proportional to 12,363.78, 18,545.64 and 4,155.78

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Solution

The fourth proportional to 12,363.78, 18,545.64 and 4,155.78 is: 6,233.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,363.78 : 18,545.64 = 4,155.78 : x
  2. Step 2: Convert to fraction form
    12,363.78/18,545.64 = 4,155.78/x
  3. Step 3: Cross multiply
    12,363.78x = 18,545.64 × 4,155.78
  4. Step 4: Simplify right side
    12,363.78x = 77,071,599.80
  5. Step 5: Solve for x
    x = 77,071,599.80/12,363.78
  6. Step 6: Final answer
    x = 6,233.66

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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.