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Finding the Fourth Proportional to 1,111.27, 1,664.40 and 915.81

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Solution

The fourth proportional to 1,111.27, 1,664.40 and 915.81 is: 1,371.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.27 : 1,664.40 = 915.81 : x
  2. Step 2: Convert to fraction form
    1,111.27/1,664.40 = 915.81/x
  3. Step 3: Cross multiply
    1,111.27x = 1,664.40 × 915.81
  4. Step 4: Simplify right side
    1,111.27x = 1,524,266.21
  5. Step 5: Solve for x
    x = 1,524,266.21/1,111.27
  6. Step 6: Final answer
    x = 1,371.64

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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.