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Finding the Fourth Proportional to 1,095.42, 1,643.91 and 518.70

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Solution

The fourth proportional to 1,095.42, 1,643.91 and 518.70 is: 778.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.42 : 1,643.91 = 518.70 : x
  2. Step 2: Convert to fraction form
    1,095.42/1,643.91 = 518.70/x
  3. Step 3: Cross multiply
    1,095.42x = 1,643.91 × 518.70
  4. Step 4: Simplify right side
    1,095.42x = 852,696.12
  5. Step 5: Solve for x
    x = 852,696.12/1,095.42
  6. Step 6: Final answer
    x = 778.42

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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.