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Finding the Fourth Proportional to 886.70, 1,223.70 and 513.80

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Solution

The fourth proportional to 886.70, 1,223.70 and 513.80 is: 709.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.70 : 1,223.70 = 513.80 : x
  2. Step 2: Convert to fraction form
    886.70/1,223.70 = 513.80/x
  3. Step 3: Cross multiply
    886.70x = 1,223.70 × 513.80
  4. Step 4: Simplify right side
    886.70x = 628,738.49
  5. Step 5: Solve for x
    x = 628,738.49/886.70
  6. Step 6: Final answer
    x = 709.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.