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Finding the Fourth Proportional to 1,084.47, 1,625.71 and 390.97

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Solution

The fourth proportional to 1,084.47, 1,625.71 and 390.97 is: 586.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,084.47 : 1,625.71 = 390.97 : x
  2. Step 2: Convert to fraction form
    1,084.47/1,625.71 = 390.97/x
  3. Step 3: Cross multiply
    1,084.47x = 1,625.71 × 390.97
  4. Step 4: Simplify right side
    1,084.47x = 635,603.84
  5. Step 5: Solve for x
    x = 635,603.84/1,084.47
  6. Step 6: Final answer
    x = 586.10

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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.