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Finding the Fourth Proportional to 881.08, 1,320.91 and 393.66

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Solution

The fourth proportional to 881.08, 1,320.91 and 393.66 is: 590.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.08 : 1,320.91 = 393.66 : x
  2. Step 2: Convert to fraction form
    881.08/1,320.91 = 393.66/x
  3. Step 3: Cross multiply
    881.08x = 1,320.91 × 393.66
  4. Step 4: Simplify right side
    881.08x = 519,988.45
  5. Step 5: Solve for x
    x = 519,988.45/881.08
  6. Step 6: Final answer
    x = 590.17

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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.