Home / 78,291.38-117,436.75-28,359.79

Finding the Fourth Proportional to 78,291.38, 117,436.75 and 28,359.79

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Solution

The fourth proportional to 78,291.38, 117,436.75 and 28,359.79 is: 42,539.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,291.38 : 117,436.75 = 28,359.79 : x
  2. Step 2: Convert to fraction form
    78,291.38/117,436.75 = 28,359.79/x
  3. Step 3: Cross multiply
    78,291.38x = 117,436.75 × 28,359.79
  4. Step 4: Simplify right side
    78,291.38x = 3,330,480,839.30
  5. Step 5: Solve for x
    x = 3,330,480,839.30/78,291.38
  6. Step 6: Final answer
    x = 42,539.56

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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.