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Finding the Fourth Proportional to 121,915.61, 168,236.78 and 68,190.26

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Solution

The fourth proportional to 121,915.61, 168,236.78 and 68,190.26 is: 94,098.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,915.61 : 168,236.78 = 68,190.26 : x
  2. Step 2: Convert to fraction form
    121,915.61/168,236.78 = 68,190.26/x
  3. Step 3: Cross multiply
    121,915.61x = 168,236.78 × 68,190.26
  4. Step 4: Simplify right side
    121,915.61x = 11,472,108,971.20
  5. Step 5: Solve for x
    x = 11,472,108,971.20/121,915.61
  6. Step 6: Final answer
    x = 94,098.77

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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.