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Finding the Fourth Proportional to 887.55, 1,331.93 and 765.64

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Solution

The fourth proportional to 887.55, 1,331.93 and 765.64 is: 1,148.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.55 : 1,331.93 = 765.64 : x
  2. Step 2: Convert to fraction form
    887.55/1,331.93 = 765.64/x
  3. Step 3: Cross multiply
    887.55x = 1,331.93 × 765.64
  4. Step 4: Simplify right side
    887.55x = 1,019,778.89
  5. Step 5: Solve for x
    x = 1,019,778.89/887.55
  6. Step 6: Final answer
    x = 1,148.98

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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.