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Finding the Fourth Proportional to 2,646.66, 3,969.99 and 915.28

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Solution

The fourth proportional to 2,646.66, 3,969.99 and 915.28 is: 1,372.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,646.66 : 3,969.99 = 915.28 : x
  2. Step 2: Convert to fraction form
    2,646.66/3,969.99 = 915.28/x
  3. Step 3: Cross multiply
    2,646.66x = 3,969.99 × 915.28
  4. Step 4: Simplify right side
    2,646.66x = 3,633,652.45
  5. Step 5: Solve for x
    x = 3,633,652.45/2,646.66
  6. Step 6: Final answer
    x = 1,372.92

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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.