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Finding the Fourth Proportional to 103,618.65, 142,993.95 and 61,179.90

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Solution

The fourth proportional to 103,618.65, 142,993.95 and 61,179.90 is: 84,428.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,618.65 : 142,993.95 = 61,179.90 : x
  2. Step 2: Convert to fraction form
    103,618.65/142,993.95 = 61,179.90/x
  3. Step 3: Cross multiply
    103,618.65x = 142,993.95 × 61,179.90
  4. Step 4: Simplify right side
    103,618.65x = 8,748,355,561.61
  5. Step 5: Solve for x
    x = 8,748,355,561.61/103,618.65
  6. Step 6: Final answer
    x = 84,428.39

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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.