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Finding the Fourth Proportional to 1,915.39, 2,872.99 and 616.76

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Solution

The fourth proportional to 1,915.39, 2,872.99 and 616.76 is: 925.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.39 : 2,872.99 = 616.76 : x
  2. Step 2: Convert to fraction form
    1,915.39/2,872.99 = 616.76/x
  3. Step 3: Cross multiply
    1,915.39x = 2,872.99 × 616.76
  4. Step 4: Simplify right side
    1,915.39x = 1,771,945.31
  5. Step 5: Solve for x
    x = 1,771,945.31/1,915.39
  6. Step 6: Final answer
    x = 925.11

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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.