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Finding the Fourth Proportional to 128,878.16, 193,279.80 and 45,795.92

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Solution

The fourth proportional to 128,878.16, 193,279.80 and 45,795.92 is: 68,680.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,878.16 : 193,279.80 = 45,795.92 : x
  2. Step 2: Convert to fraction form
    128,878.16/193,279.80 = 45,795.92/x
  3. Step 3: Cross multiply
    128,878.16x = 193,279.80 × 45,795.92
  4. Step 4: Simplify right side
    128,878.16x = 8,851,426,258.42
  5. Step 5: Solve for x
    x = 8,851,426,258.42/128,878.16
  6. Step 6: Final answer
    x = 68,680.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.