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Finding the Fourth Proportional to 887.31, 1,329.80 and 393.55

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Solution

The fourth proportional to 887.31, 1,329.80 and 393.55 is: 589.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.31 : 1,329.80 = 393.55 : x
  2. Step 2: Convert to fraction form
    887.31/1,329.80 = 393.55/x
  3. Step 3: Cross multiply
    887.31x = 1,329.80 × 393.55
  4. Step 4: Simplify right side
    887.31x = 523,342.79
  5. Step 5: Solve for x
    x = 523,342.79/887.31
  6. Step 6: Final answer
    x = 589.81

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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.