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Finding the Fourth Proportional to 85,470.30, 117,881.76 and 79,740.75

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Solution

The fourth proportional to 85,470.30, 117,881.76 and 79,740.75 is: 109,979.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,470.30 : 117,881.76 = 79,740.75 : x
  2. Step 2: Convert to fraction form
    85,470.30/117,881.76 = 79,740.75/x
  3. Step 3: Cross multiply
    85,470.30x = 117,881.76 × 79,740.75
  4. Step 4: Simplify right side
    85,470.30x = 9,399,979,953.72
  5. Step 5: Solve for x
    x = 9,399,979,953.72/85,470.30
  6. Step 6: Final answer
    x = 109,979.49

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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.