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Finding the Fourth Proportional to 1,085.81, 1,627.70 and 392.04

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Solution

The fourth proportional to 1,085.81, 1,627.70 and 392.04 is: 587.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.81 : 1,627.70 = 392.04 : x
  2. Step 2: Convert to fraction form
    1,085.81/1,627.70 = 392.04/x
  3. Step 3: Cross multiply
    1,085.81x = 1,627.70 × 392.04
  4. Step 4: Simplify right side
    1,085.81x = 638,121.55
  5. Step 5: Solve for x
    x = 638,121.55/1,085.81
  6. Step 6: Final answer
    x = 587.69

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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.