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Finding the Fourth Proportional to 1,552.72, 2,329.44 and 687.28

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Solution

The fourth proportional to 1,552.72, 2,329.44 and 687.28 is: 1,031.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,552.72 : 2,329.44 = 687.28 : x
  2. Step 2: Convert to fraction form
    1,552.72/2,329.44 = 687.28/x
  3. Step 3: Cross multiply
    1,552.72x = 2,329.44 × 687.28
  4. Step 4: Simplify right side
    1,552.72x = 1,600,977.52
  5. Step 5: Solve for x
    x = 1,600,977.52/1,552.72
  6. Step 6: Final answer
    x = 1,031.08

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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.