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Finding the Fourth Proportional to 984.31, 1,358.20 and 564.67

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Solution

The fourth proportional to 984.31, 1,358.20 and 564.67 is: 779.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.31 : 1,358.20 = 564.67 : x
  2. Step 2: Convert to fraction form
    984.31/1,358.20 = 564.67/x
  3. Step 3: Cross multiply
    984.31x = 1,358.20 × 564.67
  4. Step 4: Simplify right side
    984.31x = 766,937.20
  5. Step 5: Solve for x
    x = 766,937.20/984.31
  6. Step 6: Final answer
    x = 779.16

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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.