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Finding the Fourth Proportional to 121,455, 167,630.58 and 71,154

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Solution

The fourth proportional to 121,455, 167,630.58 and 71,154 is: 98,205.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,455 : 167,630.58 = 71,154 : x
  2. Step 2: Convert to fraction form
    121,455/167,630.58 = 71,154/x
  3. Step 3: Cross multiply
    121,455x = 167,630.58 × 71,154
  4. Step 4: Simplify right side
    121,455x = 11,927,586,289.32
  5. Step 5: Solve for x
    x = 11,927,586,289.32/121,455
  6. Step 6: Final answer
    x = 98,205.81

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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.