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Finding the Fourth Proportional to 1,612, 2,417.36 and 687.98

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Solution

The fourth proportional to 1,612, 2,417.36 and 687.98 is: 1,031.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,612 : 2,417.36 = 687.98 : x
  2. Step 2: Convert to fraction form
    1,612/2,417.36 = 687.98/x
  3. Step 3: Cross multiply
    1,612x = 2,417.36 × 687.98
  4. Step 4: Simplify right side
    1,612x = 1,663,095.33
  5. Step 5: Solve for x
    x = 1,663,095.33/1,612
  6. Step 6: Final answer
    x = 1,031.70

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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.