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Finding the Fourth Proportional to 2,147.66, 3,220.66 and 915.65

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Solution

The fourth proportional to 2,147.66, 3,220.66 and 915.65 is: 1,373.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.66 : 3,220.66 = 915.65 : x
  2. Step 2: Convert to fraction form
    2,147.66/3,220.66 = 915.65/x
  3. Step 3: Cross multiply
    2,147.66x = 3,220.66 × 915.65
  4. Step 4: Simplify right side
    2,147.66x = 2,948,997.33
  5. Step 5: Solve for x
    x = 2,948,997.33/2,147.66
  6. Step 6: Final answer
    x = 1,373.12

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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.