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Finding the Fourth Proportional to 374.40, 560.75 and 321.75

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Solution

The fourth proportional to 374.40, 560.75 and 321.75 is: 481.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.40 : 560.75 = 321.75 : x
  2. Step 2: Convert to fraction form
    374.40/560.75 = 321.75/x
  3. Step 3: Cross multiply
    374.40x = 560.75 × 321.75
  4. Step 4: Simplify right side
    374.40x = 180,421.31
  5. Step 5: Solve for x
    x = 180,421.31/374.40
  6. Step 6: Final answer
    x = 481.89

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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.