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Finding the Fourth Proportional to 886.50, 1,223.08 and 555.12

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Solution

The fourth proportional to 886.50, 1,223.08 and 555.12 is: 765.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.50 : 1,223.08 = 555.12 : x
  2. Step 2: Convert to fraction form
    886.50/1,223.08 = 555.12/x
  3. Step 3: Cross multiply
    886.50x = 1,223.08 × 555.12
  4. Step 4: Simplify right side
    886.50x = 678,954.78
  5. Step 5: Solve for x
    x = 678,954.78/886.50
  6. Step 6: Final answer
    x = 765.88

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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.