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Finding the Fourth Proportional to 139,060.20, 208,590.30 and 86,572.20

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Solution

The fourth proportional to 139,060.20, 208,590.30 and 86,572.20 is: 129,858.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,060.20 : 208,590.30 = 86,572.20 : x
  2. Step 2: Convert to fraction form
    139,060.20/208,590.30 = 86,572.20/x
  3. Step 3: Cross multiply
    139,060.20x = 208,590.30 × 86,572.20
  4. Step 4: Simplify right side
    139,060.20x = 18,058,121,169.66
  5. Step 5: Solve for x
    x = 18,058,121,169.66/139,060.20
  6. Step 6: Final answer
    x = 129,858.30

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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.