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Finding the Fourth Proportional to 1,915.81, 2,643 and 1,169.66

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Solution

The fourth proportional to 1,915.81, 2,643 and 1,169.66 is: 1,613.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.81 : 2,643 = 1,169.66 : x
  2. Step 2: Convert to fraction form
    1,915.81/2,643 = 1,169.66/x
  3. Step 3: Cross multiply
    1,915.81x = 2,643 × 1,169.66
  4. Step 4: Simplify right side
    1,915.81x = 3,091,411.38
  5. Step 5: Solve for x
    x = 3,091,411.38/1,915.81
  6. Step 6: Final answer
    x = 1,613.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.