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Finding the Fourth Proportional to 1,509.63, 2,264.23 and 687.68

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Solution

The fourth proportional to 1,509.63, 2,264.23 and 687.68 is: 1,031.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509.63 : 2,264.23 = 687.68 : x
  2. Step 2: Convert to fraction form
    1,509.63/2,264.23 = 687.68/x
  3. Step 3: Cross multiply
    1,509.63x = 2,264.23 × 687.68
  4. Step 4: Simplify right side
    1,509.63x = 1,557,065.69
  5. Step 5: Solve for x
    x = 1,557,065.69/1,509.63
  6. Step 6: Final answer
    x = 1,031.42

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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.