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Finding the Fourth Proportional to 886.98, 1,225.72 and 665.55

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Solution

The fourth proportional to 886.98, 1,225.72 and 665.55 is: 919.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.98 : 1,225.72 = 665.55 : x
  2. Step 2: Convert to fraction form
    886.98/1,225.72 = 665.55/x
  3. Step 3: Cross multiply
    886.98x = 1,225.72 × 665.55
  4. Step 4: Simplify right side
    886.98x = 815,771.69
  5. Step 5: Solve for x
    x = 815,771.69/886.98
  6. Step 6: Final answer
    x = 919.72

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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.