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Finding the Fourth Proportional to 1,117.21, 1,675.92 and 386.61

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Solution

The fourth proportional to 1,117.21, 1,675.92 and 386.61 is: 579.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.21 : 1,675.92 = 386.61 : x
  2. Step 2: Convert to fraction form
    1,117.21/1,675.92 = 386.61/x
  3. Step 3: Cross multiply
    1,117.21x = 1,675.92 × 386.61
  4. Step 4: Simplify right side
    1,117.21x = 647,927.43
  5. Step 5: Solve for x
    x = 647,927.43/1,117.21
  6. Step 6: Final answer
    x = 579.95

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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.