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Finding the Fourth Proportional to 139,058.57, 191,899.67 and 78,641.07

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Solution

The fourth proportional to 139,058.57, 191,899.67 and 78,641.07 is: 108,524.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,058.57 : 191,899.67 = 78,641.07 : x
  2. Step 2: Convert to fraction form
    139,058.57/191,899.67 = 78,641.07/x
  3. Step 3: Cross multiply
    139,058.57x = 191,899.67 × 78,641.07
  4. Step 4: Simplify right side
    139,058.57x = 15,091,194,988.24
  5. Step 5: Solve for x
    x = 15,091,194,988.24/139,058.57
  6. Step 6: Final answer
    x = 108,524.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.