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Finding the Fourth Proportional to 121,818.10, 168,160.80 and 74,086.78

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Solution

The fourth proportional to 121,818.10, 168,160.80 and 74,086.78 is: 102,271.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,818.10 : 168,160.80 = 74,086.78 : x
  2. Step 2: Convert to fraction form
    121,818.10/168,160.80 = 74,086.78/x
  3. Step 3: Cross multiply
    121,818.10x = 168,160.80 × 74,086.78
  4. Step 4: Simplify right side
    121,818.10x = 12,458,492,194.22
  5. Step 5: Solve for x
    x = 12,458,492,194.22/121,818.10
  6. Step 6: Final answer
    x = 102,271.27

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1.5x scale

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.