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Finding the Fourth Proportional to 121,806, 168,108.48 and 71,505

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Solution

The fourth proportional to 121,806, 168,108.48 and 71,505 is: 98,686.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,806 : 168,108.48 = 71,505 : x
  2. Step 2: Convert to fraction form
    121,806/168,108.48 = 71,505/x
  3. Step 3: Cross multiply
    121,806x = 168,108.48 × 71,505
  4. Step 4: Simplify right side
    121,806x = 12,020,596,862.40
  5. Step 5: Solve for x
    x = 12,020,596,862.40/121,806
  6. Step 6: Final answer
    x = 98,686.41

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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.