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Finding the Fourth Proportional to 1,095.39, 1,643.31 and 355.06

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Solution

The fourth proportional to 1,095.39, 1,643.31 and 355.06 is: 532.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.39 : 1,643.31 = 355.06 : x
  2. Step 2: Convert to fraction form
    1,095.39/1,643.31 = 355.06/x
  3. Step 3: Cross multiply
    1,095.39x = 1,643.31 × 355.06
  4. Step 4: Simplify right side
    1,095.39x = 583,463.66
  5. Step 5: Solve for x
    x = 583,463.66/1,095.39
  6. Step 6: Final answer
    x = 532.66

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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.