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Finding the Fourth Proportional to 136,880.52, 205,386.36 and 66,721.56

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Solution

The fourth proportional to 136,880.52, 205,386.36 and 66,721.56 is: 100,114.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,880.52 : 205,386.36 = 66,721.56 : x
  2. Step 2: Convert to fraction form
    136,880.52/205,386.36 = 66,721.56/x
  3. Step 3: Cross multiply
    136,880.52x = 205,386.36 × 66,721.56
  4. Step 4: Simplify right side
    136,880.52x = 13,703,698,341.92
  5. Step 5: Solve for x
    x = 13,703,698,341.92/136,880.52
  6. Step 6: Final answer
    x = 100,114.31

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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.