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Finding the Fourth Proportional to 961.34, 1,440.65 and 383.54

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Solution

The fourth proportional to 961.34, 1,440.65 and 383.54 is: 574.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.34 : 1,440.65 = 383.54 : x
  2. Step 2: Convert to fraction form
    961.34/1,440.65 = 383.54/x
  3. Step 3: Cross multiply
    961.34x = 1,440.65 × 383.54
  4. Step 4: Simplify right side
    961.34x = 552,551.46
  5. Step 5: Solve for x
    x = 552,551.46/961.34
  6. Step 6: Final answer
    x = 574.77

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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.