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Finding the Fourth Proportional to 87,690.36, 121,012.71 and 47,404

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Solution

The fourth proportional to 87,690.36, 121,012.71 and 47,404 is: 65,417.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,690.36 : 121,012.71 = 47,404 : x
  2. Step 2: Convert to fraction form
    87,690.36/121,012.71 = 47,404/x
  3. Step 3: Cross multiply
    87,690.36x = 121,012.71 × 47,404
  4. Step 4: Simplify right side
    87,690.36x = 5,736,486,504.84
  5. Step 5: Solve for x
    x = 5,736,486,504.84/87,690.36
  6. Step 6: Final answer
    x = 65,417.53

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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.