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Finding the Fourth Proportional to 168,139.95, 252,072.63 and 78,238.86

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Solution

The fourth proportional to 168,139.95, 252,072.63 and 78,238.86 is: 117,294.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    168,139.95 : 252,072.63 = 78,238.86 : x
  2. Step 2: Convert to fraction form
    168,139.95/252,072.63 = 78,238.86/x
  3. Step 3: Cross multiply
    168,139.95x = 252,072.63 × 78,238.86
  4. Step 4: Simplify right side
    168,139.95x = 19,721,875,208.40
  5. Step 5: Solve for x
    x = 19,721,875,208.40/168,139.95
  6. Step 6: Final answer
    x = 117,294.40

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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.