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Finding the Fourth Proportional to 1,125.99, 1,689.12 and 345.96

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Solution

The fourth proportional to 1,125.99, 1,689.12 and 345.96 is: 518.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.99 : 1,689.12 = 345.96 : x
  2. Step 2: Convert to fraction form
    1,125.99/1,689.12 = 345.96/x
  3. Step 3: Cross multiply
    1,125.99x = 1,689.12 × 345.96
  4. Step 4: Simplify right side
    1,125.99x = 584,367.96
  5. Step 5: Solve for x
    x = 584,367.96/1,125.99
  6. Step 6: Final answer
    x = 518.98

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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.