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Finding the Fourth Proportional to 85,716.40, 118,288.56 and 47,990.68

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Solution

The fourth proportional to 85,716.40, 118,288.56 and 47,990.68 is: 66,227.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,716.40 : 118,288.56 = 47,990.68 : x
  2. Step 2: Convert to fraction form
    85,716.40/118,288.56 = 47,990.68/x
  3. Step 3: Cross multiply
    85,716.40x = 118,288.56 × 47,990.68
  4. Step 4: Simplify right side
    85,716.40x = 5,676,748,430.62
  5. Step 5: Solve for x
    x = 5,676,748,430.62/85,716.40
  6. Step 6: Final answer
    x = 66,227.10

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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.