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Finding the Fourth Proportional to 121,748.64, 167,700.60 and 85,875.60

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Solution

The fourth proportional to 121,748.64, 167,700.60 and 85,875.60 is: 118,287.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,748.64 : 167,700.60 = 85,875.60 : x
  2. Step 2: Convert to fraction form
    121,748.64/167,700.60 = 85,875.60/x
  3. Step 3: Cross multiply
    121,748.64x = 167,700.60 × 85,875.60
  4. Step 4: Simplify right side
    121,748.64x = 14,401,389,645.36
  5. Step 5: Solve for x
    x = 14,401,389,645.36/121,748.64
  6. Step 6: Final answer
    x = 118,287.89

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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.