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Finding the Fourth Proportional to 121,570.30, 182,221.80 and 42,643.90

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Solution

The fourth proportional to 121,570.30, 182,221.80 and 42,643.90 is: 63,918.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,570.30 : 182,221.80 = 42,643.90 : x
  2. Step 2: Convert to fraction form
    121,570.30/182,221.80 = 42,643.90/x
  3. Step 3: Cross multiply
    121,570.30x = 182,221.80 × 42,643.90
  4. Step 4: Simplify right side
    121,570.30x = 7,770,648,217.02
  5. Step 5: Solve for x
    x = 7,770,648,217.02/121,570.30
  6. Step 6: Final answer
    x = 63,918.97

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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.