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Finding the Fourth Proportional to 886.68, 1,328.91 and 392.95

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Solution

The fourth proportional to 886.68, 1,328.91 and 392.95 is: 588.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.68 : 1,328.91 = 392.95 : x
  2. Step 2: Convert to fraction form
    886.68/1,328.91 = 392.95/x
  3. Step 3: Cross multiply
    886.68x = 1,328.91 × 392.95
  4. Step 4: Simplify right side
    886.68x = 522,195.37
  5. Step 5: Solve for x
    x = 522,195.37/886.68
  6. Step 6: Final answer
    x = 588.93

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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.