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Finding the Fourth Proportional to 1,083.75, 1,625.91 and 390.57

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Solution

The fourth proportional to 1,083.75, 1,625.91 and 390.57 is: 585.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.75 : 1,625.91 = 390.57 : x
  2. Step 2: Convert to fraction form
    1,083.75/1,625.91 = 390.57/x
  3. Step 3: Cross multiply
    1,083.75x = 1,625.91 × 390.57
  4. Step 4: Simplify right side
    1,083.75x = 635,031.67
  5. Step 5: Solve for x
    x = 635,031.67/1,083.75
  6. Step 6: Final answer
    x = 585.96

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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.