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Finding the Fourth Proportional to 984.40, 1,357.96 and 669.52

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Solution

The fourth proportional to 984.40, 1,357.96 and 669.52 is: 923.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.40 : 1,357.96 = 669.52 : x
  2. Step 2: Convert to fraction form
    984.40/1,357.96 = 669.52/x
  3. Step 3: Cross multiply
    984.40x = 1,357.96 × 669.52
  4. Step 4: Simplify right side
    984.40x = 909,181.38
  5. Step 5: Solve for x
    x = 909,181.38/984.40
  6. Step 6: Final answer
    x = 923.59

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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.