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Finding the Fourth Proportional to 81,078.70, 121,587.06 and 38,947.06

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Solution

The fourth proportional to 81,078.70, 121,587.06 and 38,947.06 is: 58,405.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,078.70 : 121,587.06 = 38,947.06 : x
  2. Step 2: Convert to fraction form
    81,078.70/121,587.06 = 38,947.06/x
  3. Step 3: Cross multiply
    81,078.70x = 121,587.06 × 38,947.06
  4. Step 4: Simplify right side
    81,078.70x = 4,735,458,521.04
  5. Step 5: Solve for x
    x = 4,735,458,521.04/81,078.70
  6. Step 6: Final answer
    x = 58,405.70

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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.