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Finding the Fourth Proportional to 81,285.94, 111,925.32 and 71,157.70

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Solution

The fourth proportional to 81,285.94, 111,925.32 and 71,157.70 is: 97,979.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,285.94 : 111,925.32 = 71,157.70 : x
  2. Step 2: Convert to fraction form
    81,285.94/111,925.32 = 71,157.70/x
  3. Step 3: Cross multiply
    81,285.94x = 111,925.32 × 71,157.70
  4. Step 4: Simplify right side
    81,285.94x = 7,964,348,342.96
  5. Step 5: Solve for x
    x = 7,964,348,342.96/81,285.94
  6. Step 6: Final answer
    x = 97,979.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.