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Finding the Fourth Proportional to 1,040.84, 1,561.28 and 271.34

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Solution

The fourth proportional to 1,040.84, 1,561.28 and 271.34 is: 407.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.84 : 1,561.28 = 271.34 : x
  2. Step 2: Convert to fraction form
    1,040.84/1,561.28 = 271.34/x
  3. Step 3: Cross multiply
    1,040.84x = 1,561.28 × 271.34
  4. Step 4: Simplify right side
    1,040.84x = 423,634.41
  5. Step 5: Solve for x
    x = 423,634.41/1,040.84
  6. Step 6: Final answer
    x = 407.01

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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.