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Finding the Fourth Proportional to 1,385.08, 1,911.16 and 1,122.64

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Solution

The fourth proportional to 1,385.08, 1,911.16 and 1,122.64 is: 1,549.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.08 : 1,911.16 = 1,122.64 : x
  2. Step 2: Convert to fraction form
    1,385.08/1,911.16 = 1,122.64/x
  3. Step 3: Cross multiply
    1,385.08x = 1,911.16 × 1,122.64
  4. Step 4: Simplify right side
    1,385.08x = 2,145,544.66
  5. Step 5: Solve for x
    x = 2,145,544.66/1,385.08
  6. Step 6: Final answer
    x = 1,549.04

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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.