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Finding the Fourth Proportional to 121,318.70, 181,978.05 and 42,424.70

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Solution

The fourth proportional to 121,318.70, 181,978.05 and 42,424.70 is: 63,637.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,318.70 : 181,978.05 = 42,424.70 : x
  2. Step 2: Convert to fraction form
    121,318.70/181,978.05 = 42,424.70/x
  3. Step 3: Cross multiply
    121,318.70x = 181,978.05 × 42,424.70
  4. Step 4: Simplify right side
    121,318.70x = 7,720,364,177.84
  5. Step 5: Solve for x
    x = 7,720,364,177.84/121,318.70
  6. Step 6: Final answer
    x = 63,637.05

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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.