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Finding the Fourth Proportional to 220,915.40, 331,373.10 and 71,155.40

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Solution

The fourth proportional to 220,915.40, 331,373.10 and 71,155.40 is: 106,733.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,915.40 : 331,373.10 = 71,155.40 : x
  2. Step 2: Convert to fraction form
    220,915.40/331,373.10 = 71,155.40/x
  3. Step 3: Cross multiply
    220,915.40x = 331,373.10 × 71,155.40
  4. Step 4: Simplify right side
    220,915.40x = 23,578,985,479.74
  5. Step 5: Solve for x
    x = 23,578,985,479.74/220,915.40
  6. Step 6: Final answer
    x = 106,733.10

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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.