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Finding the Fourth Proportional to 711.74, 1,066.79 and 382.28

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Solution

The fourth proportional to 711.74, 1,066.79 and 382.28 is: 572.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.74 : 1,066.79 = 382.28 : x
  2. Step 2: Convert to fraction form
    711.74/1,066.79 = 382.28/x
  3. Step 3: Cross multiply
    711.74x = 1,066.79 × 382.28
  4. Step 4: Simplify right side
    711.74x = 407,813.24
  5. Step 5: Solve for x
    x = 407,813.24/711.74
  6. Step 6: Final answer
    x = 572.98

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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.