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Finding the Fourth Proportional to 1,189.16, 1,640.18 and 919

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Solution

The fourth proportional to 1,189.16, 1,640.18 and 919 is: 1,267.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.16 : 1,640.18 = 919 : x
  2. Step 2: Convert to fraction form
    1,189.16/1,640.18 = 919/x
  3. Step 3: Cross multiply
    1,189.16x = 1,640.18 × 919
  4. Step 4: Simplify right side
    1,189.16x = 1,507,325.42
  5. Step 5: Solve for x
    x = 1,507,325.42/1,189.16
  6. Step 6: Final answer
    x = 1,267.55

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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.