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Finding the Fourth Proportional to 121,664.03, 167,885.06 and 78,644.52

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Solution

The fourth proportional to 121,664.03, 167,885.06 and 78,644.52 is: 108,522.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,664.03 : 167,885.06 = 78,644.52 : x
  2. Step 2: Convert to fraction form
    121,664.03/167,885.06 = 78,644.52/x
  3. Step 3: Cross multiply
    121,664.03x = 167,885.06 × 78,644.52
  4. Step 4: Simplify right side
    121,664.03x = 13,203,239,565.65
  5. Step 5: Solve for x
    x = 13,203,239,565.65/121,664.03
  6. Step 6: Final answer
    x = 108,522.13

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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.