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Finding the Fourth Proportional to 1,017.72, 1,523.94 and 872.40

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Solution

The fourth proportional to 1,017.72, 1,523.94 and 872.40 is: 1,306.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.72 : 1,523.94 = 872.40 : x
  2. Step 2: Convert to fraction form
    1,017.72/1,523.94 = 872.40/x
  3. Step 3: Cross multiply
    1,017.72x = 1,523.94 × 872.40
  4. Step 4: Simplify right side
    1,017.72x = 1,329,485.26
  5. Step 5: Solve for x
    x = 1,329,485.26/1,017.72
  6. Step 6: Final answer
    x = 1,306.34

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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.