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Finding the Fourth Proportional to 711.32, 1,066.37 and 418.50

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Solution

The fourth proportional to 711.32, 1,066.37 and 418.50 is: 627.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.32 : 1,066.37 = 418.50 : x
  2. Step 2: Convert to fraction form
    711.32/1,066.37 = 418.50/x
  3. Step 3: Cross multiply
    711.32x = 1,066.37 × 418.50
  4. Step 4: Simplify right side
    711.32x = 446,273.75
  5. Step 5: Solve for x
    x = 446,273.75/711.32
  6. Step 6: Final answer
    x = 627.39

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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.