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Finding the Fourth Proportional to 985.07, 1,359.41 and 565.45

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Solution

The fourth proportional to 985.07, 1,359.41 and 565.45 is: 780.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.07 : 1,359.41 = 565.45 : x
  2. Step 2: Convert to fraction form
    985.07/1,359.41 = 565.45/x
  3. Step 3: Cross multiply
    985.07x = 1,359.41 × 565.45
  4. Step 4: Simplify right side
    985.07x = 768,672.16
  5. Step 5: Solve for x
    x = 768,672.16/985.07
  6. Step 6: Final answer
    x = 780.32

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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.