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Finding the Fourth Proportional to 881.13, 1,320.65 and 393.11

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Solution

The fourth proportional to 881.13, 1,320.65 and 393.11 is: 589.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.13 : 1,320.65 = 393.11 : x
  2. Step 2: Convert to fraction form
    881.13/1,320.65 = 393.11/x
  3. Step 3: Cross multiply
    881.13x = 1,320.65 × 393.11
  4. Step 4: Simplify right side
    881.13x = 519,160.72
  5. Step 5: Solve for x
    x = 519,160.72/881.13
  6. Step 6: Final answer
    x = 589.20

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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.