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Finding the Fourth Proportional to 1,385.12, 1,911.84 and 919.52

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Solution

The fourth proportional to 1,385.12, 1,911.84 and 919.52 is: 1,269.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.12 : 1,911.84 = 919.52 : x
  2. Step 2: Convert to fraction form
    1,385.12/1,911.84 = 919.52/x
  3. Step 3: Cross multiply
    1,385.12x = 1,911.84 × 919.52
  4. Step 4: Simplify right side
    1,385.12x = 1,757,975.12
  5. Step 5: Solve for x
    x = 1,757,975.12/1,385.12
  6. Step 6: Final answer
    x = 1,269.19

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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.