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Finding the Fourth Proportional to 121,353.80, 181,982.10 and 42,427.40

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Solution

The fourth proportional to 121,353.80, 181,982.10 and 42,427.40 is: 63,624.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,353.80 : 181,982.10 = 42,427.40 : x
  2. Step 2: Convert to fraction form
    121,353.80/181,982.10 = 42,427.40/x
  3. Step 3: Cross multiply
    121,353.80x = 181,982.10 × 42,427.40
  4. Step 4: Simplify right side
    121,353.80x = 7,721,027,349.54
  5. Step 5: Solve for x
    x = 7,721,027,349.54/121,353.80
  6. Step 6: Final answer
    x = 63,624.11

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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.