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Finding the Fourth Proportional to 65,859.90, 90,862.20 and 41,981.10

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Solution

The fourth proportional to 65,859.90, 90,862.20 and 41,981.10 is: 57,918.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,859.90 : 90,862.20 = 41,981.10 : x
  2. Step 2: Convert to fraction form
    65,859.90/90,862.20 = 41,981.10/x
  3. Step 3: Cross multiply
    65,859.90x = 90,862.20 × 41,981.10
  4. Step 4: Simplify right side
    65,859.90x = 3,814,495,104.42
  5. Step 5: Solve for x
    x = 3,814,495,104.42/65,859.90
  6. Step 6: Final answer
    x = 57,918.33

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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.