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Finding the Fourth Proportional to 121,574.53, 167,861.72 and 78,579.46

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Solution

The fourth proportional to 121,574.53, 167,861.72 and 78,579.46 is: 108,497.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,574.53 : 167,861.72 = 78,579.46 : x
  2. Step 2: Convert to fraction form
    121,574.53/167,861.72 = 78,579.46/x
  3. Step 3: Cross multiply
    121,574.53x = 167,861.72 × 78,579.46
  4. Step 4: Simplify right side
    121,574.53x = 13,190,483,312.27
  5. Step 5: Solve for x
    x = 13,190,483,312.27/121,574.53
  6. Step 6: Final answer
    x = 108,497.09

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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.