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Finding the Fourth Proportional to 880.93, 1,321.90 and 393.98

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Solution

The fourth proportional to 880.93, 1,321.90 and 393.98 is: 591.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.93 : 1,321.90 = 393.98 : x
  2. Step 2: Convert to fraction form
    880.93/1,321.90 = 393.98/x
  3. Step 3: Cross multiply
    880.93x = 1,321.90 × 393.98
  4. Step 4: Simplify right side
    880.93x = 520,795.55
  5. Step 5: Solve for x
    x = 520,795.55/880.93
  6. Step 6: Final answer
    x = 591.19

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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.