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Finding the Fourth Proportional to 137,208.20, 205,941.90 and 84,720.20

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Solution

The fourth proportional to 137,208.20, 205,941.90 and 84,720.20 is: 127,160.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,208.20 : 205,941.90 = 84,720.20 : x
  2. Step 2: Convert to fraction form
    137,208.20/205,941.90 = 84,720.20/x
  3. Step 3: Cross multiply
    137,208.20x = 205,941.90 × 84,720.20
  4. Step 4: Simplify right side
    137,208.20x = 17,447,438,956.38
  5. Step 5: Solve for x
    x = 17,447,438,956.38/137,208.20
  6. Step 6: Final answer
    x = 127,160.32

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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.