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Finding the Fourth Proportional to 1,015.71, 1,401.08 and 642.04

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Solution

The fourth proportional to 1,015.71, 1,401.08 and 642.04 is: 885.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.71 : 1,401.08 = 642.04 : x
  2. Step 2: Convert to fraction form
    1,015.71/1,401.08 = 642.04/x
  3. Step 3: Cross multiply
    1,015.71x = 1,401.08 × 642.04
  4. Step 4: Simplify right side
    1,015.71x = 899,542.69
  5. Step 5: Solve for x
    x = 899,542.69/1,015.71
  6. Step 6: Final answer
    x = 885.63

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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.