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Finding the Fourth Proportional to 1,915.18, 2,870.07 and 872.62

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Solution

The fourth proportional to 1,915.18, 2,870.07 and 872.62 is: 1,307.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.18 : 2,870.07 = 872.62 : x
  2. Step 2: Convert to fraction form
    1,915.18/2,870.07 = 872.62/x
  3. Step 3: Cross multiply
    1,915.18x = 2,870.07 × 872.62
  4. Step 4: Simplify right side
    1,915.18x = 2,504,480.48
  5. Step 5: Solve for x
    x = 2,504,480.48/1,915.18
  6. Step 6: Final answer
    x = 1,307.70

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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.