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Finding the Fourth Proportional to 87,891.81, 121,290.65 and 47,605.56

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Solution

The fourth proportional to 87,891.81, 121,290.65 and 47,605.56 is: 65,695.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,891.81 : 121,290.65 = 47,605.56 : x
  2. Step 2: Convert to fraction form
    87,891.81/121,290.65 = 47,605.56/x
  3. Step 3: Cross multiply
    87,891.81x = 121,290.65 × 47,605.56
  4. Step 4: Simplify right side
    87,891.81x = 5,774,109,077.99
  5. Step 5: Solve for x
    x = 5,774,109,077.99/87,891.81
  6. Step 6: Final answer
    x = 65,695.64

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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.