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Finding the Fourth Proportional to 80,856.40, 121,284.60 and 77,227.60

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Solution

The fourth proportional to 80,856.40, 121,284.60 and 77,227.60 is: 115,841.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,856.40 : 121,284.60 = 77,227.60 : x
  2. Step 2: Convert to fraction form
    80,856.40/121,284.60 = 77,227.60/x
  3. Step 3: Cross multiply
    80,856.40x = 121,284.60 × 77,227.60
  4. Step 4: Simplify right side
    80,856.40x = 9,366,518,574.96
  5. Step 5: Solve for x
    x = 9,366,518,574.96/80,856.40
  6. Step 6: Final answer
    x = 115,841.40

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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.