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Finding the Fourth Proportional to 121,931.70, 168,323.27 and 91,728.52

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Solution

The fourth proportional to 121,931.70, 168,323.27 and 91,728.52 is: 126,628.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,931.70 : 168,323.27 = 91,728.52 : x
  2. Step 2: Convert to fraction form
    121,931.70/168,323.27 = 91,728.52/x
  3. Step 3: Cross multiply
    121,931.70x = 168,323.27 × 91,728.52
  4. Step 4: Simplify right side
    121,931.70x = 15,440,044,438.66
  5. Step 5: Solve for x
    x = 15,440,044,438.66/121,931.70
  6. Step 6: Final answer
    x = 126,628.63

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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.