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Finding the Fourth Proportional to 68,921.80, 103,479.90 and 42,677.80

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Solution

The fourth proportional to 68,921.80, 103,479.90 and 42,677.80 is: 64,076.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,921.80 : 103,479.90 = 42,677.80 : x
  2. Step 2: Convert to fraction form
    68,921.80/103,479.90 = 42,677.80/x
  3. Step 3: Cross multiply
    68,921.80x = 103,479.90 × 42,677.80
  4. Step 4: Simplify right side
    68,921.80x = 4,416,294,476.22
  5. Step 5: Solve for x
    x = 4,416,294,476.22/68,921.80
  6. Step 6: Final answer
    x = 64,076.89

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1.5x scale

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.