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Finding the Fourth Proportional to 40,860, 61,290 and 13,158

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Solution

The fourth proportional to 40,860, 61,290 and 13,158 is: 19,737

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,860 : 61,290 = 13,158 : x
  2. Step 2: Convert to fraction form
    40,860/61,290 = 13,158/x
  3. Step 3: Cross multiply
    40,860x = 61,290 × 13,158
  4. Step 4: Simplify right side
    40,860x = 806,453,820
  5. Step 5: Solve for x
    x = 806,453,820/40,860
  6. Step 6: Final answer
    x = 19,737

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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.