Home / 78,218.28-117,275.60-28,291.81

Finding the Fourth Proportional to 78,218.28, 117,275.60 and 28,291.81

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Solution

The fourth proportional to 78,218.28, 117,275.60 and 28,291.81 is: 42,418.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,218.28 : 117,275.60 = 28,291.81 : x
  2. Step 2: Convert to fraction form
    78,218.28/117,275.60 = 28,291.81/x
  3. Step 3: Cross multiply
    78,218.28x = 117,275.60 × 28,291.81
  4. Step 4: Simplify right side
    78,218.28x = 3,317,938,501.29
  5. Step 5: Solve for x
    x = 3,317,938,501.29/78,218.28
  6. Step 6: Final answer
    x = 42,418.96

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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.