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Finding the Fourth Proportional to 121,011.78, 181,503.08 and 42,119.40

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Solution

The fourth proportional to 121,011.78, 181,503.08 and 42,119.40 is: 63,174.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,011.78 : 181,503.08 = 42,119.40 : x
  2. Step 2: Convert to fraction form
    121,011.78/181,503.08 = 42,119.40/x
  3. Step 3: Cross multiply
    121,011.78x = 181,503.08 × 42,119.40
  4. Step 4: Simplify right side
    121,011.78x = 7,644,800,827.75
  5. Step 5: Solve for x
    x = 7,644,800,827.75/121,011.78
  6. Step 6: Final answer
    x = 63,174.02

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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.