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Finding the Fourth Proportional to 985.37, 1,359.79 and 565.72

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Solution

The fourth proportional to 985.37, 1,359.79 and 565.72 is: 780.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.37 : 1,359.79 = 565.72 : x
  2. Step 2: Convert to fraction form
    985.37/1,359.79 = 565.72/x
  3. Step 3: Cross multiply
    985.37x = 1,359.79 × 565.72
  4. Step 4: Simplify right side
    985.37x = 769,255.59
  5. Step 5: Solve for x
    x = 769,255.59/985.37
  6. Step 6: Final answer
    x = 780.68

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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.