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Finding the Fourth Proportional to 887.21, 1,330.19 and 393.34

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Solution

The fourth proportional to 887.21, 1,330.19 and 393.34 is: 589.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.21 : 1,330.19 = 393.34 : x
  2. Step 2: Convert to fraction form
    887.21/1,330.19 = 393.34/x
  3. Step 3: Cross multiply
    887.21x = 1,330.19 × 393.34
  4. Step 4: Simplify right side
    887.21x = 523,221.74
  5. Step 5: Solve for x
    x = 523,221.74/887.21
  6. Step 6: Final answer
    x = 589.74

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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.