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Finding the Fourth Proportional to 121,344.70, 182,017.05 and 85,915.30

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Solution

The fourth proportional to 121,344.70, 182,017.05 and 85,915.30 is: 128,872.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,344.70 : 182,017.05 = 85,915.30 : x
  2. Step 2: Convert to fraction form
    121,344.70/182,017.05 = 85,915.30/x
  3. Step 3: Cross multiply
    121,344.70x = 182,017.05 × 85,915.30
  4. Step 4: Simplify right side
    121,344.70x = 15,638,049,455.87
  5. Step 5: Solve for x
    x = 15,638,049,455.87/121,344.70
  6. Step 6: Final answer
    x = 128,872.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.