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Finding the Fourth Proportional to 711.18, 1,065.56 and 385.56

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Solution

The fourth proportional to 711.18, 1,065.56 and 385.56 is: 577.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.18 : 1,065.56 = 385.56 : x
  2. Step 2: Convert to fraction form
    711.18/1,065.56 = 385.56/x
  3. Step 3: Cross multiply
    711.18x = 1,065.56 × 385.56
  4. Step 4: Simplify right side
    711.18x = 410,835.39
  5. Step 5: Solve for x
    x = 410,835.39/711.18
  6. Step 6: Final answer
    x = 577.68

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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.