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Finding the Fourth Proportional to 985.55, 1,359.06 and 720.03

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Solution

The fourth proportional to 985.55, 1,359.06 and 720.03 is: 992.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.55 : 1,359.06 = 720.03 : x
  2. Step 2: Convert to fraction form
    985.55/1,359.06 = 720.03/x
  3. Step 3: Cross multiply
    985.55x = 1,359.06 × 720.03
  4. Step 4: Simplify right side
    985.55x = 978,563.97
  5. Step 5: Solve for x
    x = 978,563.97/985.55
  6. Step 6: Final answer
    x = 992.92

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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.