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Finding the Fourth Proportional to 1,128.65, 1,692.51 and 398.06

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Solution

The fourth proportional to 1,128.65, 1,692.51 and 398.06 is: 596.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.65 : 1,692.51 = 398.06 : x
  2. Step 2: Convert to fraction form
    1,128.65/1,692.51 = 398.06/x
  3. Step 3: Cross multiply
    1,128.65x = 1,692.51 × 398.06
  4. Step 4: Simplify right side
    1,128.65x = 673,720.53
  5. Step 5: Solve for x
    x = 673,720.53/1,128.65
  6. Step 6: Final answer
    x = 596.93

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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.