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Finding the Fourth Proportional to 78,920.60, 118,251.30 and 65,701.40

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Solution

The fourth proportional to 78,920.60, 118,251.30 and 65,701.40 is: 98,444.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.60 : 118,251.30 = 65,701.40 : x
  2. Step 2: Convert to fraction form
    78,920.60/118,251.30 = 65,701.40/x
  3. Step 3: Cross multiply
    78,920.60x = 118,251.30 × 65,701.40
  4. Step 4: Simplify right side
    78,920.60x = 7,769,275,961.82
  5. Step 5: Solve for x
    x = 7,769,275,961.82/78,920.60
  6. Step 6: Final answer
    x = 98,444.21

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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.