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Finding the Fourth Proportional to 85,505.40, 117,920.79 and 71,212.68

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Solution

The fourth proportional to 85,505.40, 117,920.79 and 71,212.68 is: 98,209.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,505.40 : 117,920.79 = 71,212.68 : x
  2. Step 2: Convert to fraction form
    85,505.40/117,920.79 = 71,212.68/x
  3. Step 3: Cross multiply
    85,505.40x = 117,920.79 × 71,212.68
  4. Step 4: Simplify right side
    85,505.40x = 8,397,455,483.62
  5. Step 5: Solve for x
    x = 8,397,455,483.62/85,505.40
  6. Step 6: Final answer
    x = 98,209.65

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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.