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Finding the Fourth Proportional to 121,915.77, 168,270.09 and 74,184.48

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Solution

The fourth proportional to 121,915.77, 168,270.09 and 74,184.48 is: 102,390.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,915.77 : 168,270.09 = 74,184.48 : x
  2. Step 2: Convert to fraction form
    121,915.77/168,270.09 = 74,184.48/x
  3. Step 3: Cross multiply
    121,915.77x = 168,270.09 × 74,184.48
  4. Step 4: Simplify right side
    121,915.77x = 12,483,029,126.20
  5. Step 5: Solve for x
    x = 12,483,029,126.20/121,915.77
  6. Step 6: Final answer
    x = 102,390.60

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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.