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Finding the Fourth Proportional to 121,886.07, 168,203.16 and 68,172

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Solution

The fourth proportional to 121,886.07, 168,203.16 and 68,172 is: 94,077.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,886.07 : 168,203.16 = 68,172 : x
  2. Step 2: Convert to fraction form
    121,886.07/168,203.16 = 68,172/x
  3. Step 3: Cross multiply
    121,886.07x = 168,203.16 × 68,172
  4. Step 4: Simplify right side
    121,886.07x = 11,466,745,823.52
  5. Step 5: Solve for x
    x = 11,466,745,823.52/121,886.07
  6. Step 6: Final answer
    x = 94,077.57

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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.