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Finding the Fourth Proportional to 121,234.39, 167,129.94 and 85,312.78

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Solution

The fourth proportional to 121,234.39, 167,129.94 and 85,312.78 is: 117,609.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,234.39 : 167,129.94 = 85,312.78 : x
  2. Step 2: Convert to fraction form
    121,234.39/167,129.94 = 85,312.78/x
  3. Step 3: Cross multiply
    121,234.39x = 167,129.94 × 85,312.78
  4. Step 4: Simplify right side
    121,234.39x = 14,258,319,802.63
  5. Step 5: Solve for x
    x = 14,258,319,802.63/121,234.39
  6. Step 6: Final answer
    x = 117,609.53

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1.5x scale

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.