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Finding the Fourth Proportional to 1,085.67, 1,628.53 and 392.39

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Solution

The fourth proportional to 1,085.67, 1,628.53 and 392.39 is: 588.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.67 : 1,628.53 = 392.39 : x
  2. Step 2: Convert to fraction form
    1,085.67/1,628.53 = 392.39/x
  3. Step 3: Cross multiply
    1,085.67x = 1,628.53 × 392.39
  4. Step 4: Simplify right side
    1,085.67x = 639,018.89
  5. Step 5: Solve for x
    x = 639,018.89/1,085.67
  6. Step 6: Final answer
    x = 588.59

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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.