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Finding the Fourth Proportional to 985.46, 1,359.83 and 565.67

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Solution

The fourth proportional to 985.46, 1,359.83 and 565.67 is: 780.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.46 : 1,359.83 = 565.67 : x
  2. Step 2: Convert to fraction form
    985.46/1,359.83 = 565.67/x
  3. Step 3: Cross multiply
    985.46x = 1,359.83 × 565.67
  4. Step 4: Simplify right side
    985.46x = 769,205.41
  5. Step 5: Solve for x
    x = 769,205.41/985.46
  6. Step 6: Final answer
    x = 780.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.