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Finding the Fourth Proportional to 1,128.33, 1,692.50 and 398.12

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Solution

The fourth proportional to 1,128.33, 1,692.50 and 398.12 is: 597.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.33 : 1,692.50 = 398.12 : x
  2. Step 2: Convert to fraction form
    1,128.33/1,692.50 = 398.12/x
  3. Step 3: Cross multiply
    1,128.33x = 1,692.50 × 398.12
  4. Step 4: Simplify right side
    1,128.33x = 673,807.65
  5. Step 5: Solve for x
    x = 673,807.65/1,128.33
  6. Step 6: Final answer
    x = 597.17

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.