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Finding the Fourth Proportional to 139,537.80, 209,306.70 and 123,208.20

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Solution

The fourth proportional to 139,537.80, 209,306.70 and 123,208.20 is: 184,812.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,537.80 : 209,306.70 = 123,208.20 : x
  2. Step 2: Convert to fraction form
    139,537.80/209,306.70 = 123,208.20/x
  3. Step 3: Cross multiply
    139,537.80x = 209,306.70 × 123,208.20
  4. Step 4: Simplify right side
    139,537.80x = 25,788,301,754.94
  5. Step 5: Solve for x
    x = 25,788,301,754.94/139,537.80
  6. Step 6: Final answer
    x = 184,812.30

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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.