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Finding the Fourth Proportional to 112,906.40, 169,359.60 and 56,919.20

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Solution

The fourth proportional to 112,906.40, 169,359.60 and 56,919.20 is: 85,378.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,906.40 : 169,359.60 = 56,919.20 : x
  2. Step 2: Convert to fraction form
    112,906.40/169,359.60 = 56,919.20/x
  3. Step 3: Cross multiply
    112,906.40x = 169,359.60 × 56,919.20
  4. Step 4: Simplify right side
    112,906.40x = 9,639,812,944.32
  5. Step 5: Solve for x
    x = 9,639,812,944.32/112,906.40
  6. Step 6: Final answer
    x = 85,378.80

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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.