Home / 78,885.12-118,382.40-71,355.84

Finding the Fourth Proportional to 78,885.12, 118,382.40 and 71,355.84

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Solution

The fourth proportional to 78,885.12, 118,382.40 and 71,355.84 is: 107,083.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,885.12 : 118,382.40 = 71,355.84 : x
  2. Step 2: Convert to fraction form
    78,885.12/118,382.40 = 71,355.84/x
  3. Step 3: Cross multiply
    78,885.12x = 118,382.40 × 71,355.84
  4. Step 4: Simplify right side
    78,885.12x = 8,447,275,593.22
  5. Step 5: Solve for x
    x = 8,447,275,593.22/78,885.12
  6. Step 6: Final answer
    x = 107,083.26

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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.