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Finding the Fourth Proportional to 984.13, 1,359.78 and 859.60

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Solution

The fourth proportional to 984.13, 1,359.78 and 859.60 is: 1,187.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.13 : 1,359.78 = 859.60 : x
  2. Step 2: Convert to fraction form
    984.13/1,359.78 = 859.60/x
  3. Step 3: Cross multiply
    984.13x = 1,359.78 × 859.60
  4. Step 4: Simplify right side
    984.13x = 1,168,866.89
  5. Step 5: Solve for x
    x = 1,168,866.89/984.13
  6. Step 6: Final answer
    x = 1,187.72

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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.