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Finding the Fourth Proportional to 1,385.46, 1,911.44 and 914.24

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Solution

The fourth proportional to 1,385.46, 1,911.44 and 914.24 is: 1,261.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.46 : 1,911.44 = 914.24 : x
  2. Step 2: Convert to fraction form
    1,385.46/1,911.44 = 914.24/x
  3. Step 3: Cross multiply
    1,385.46x = 1,911.44 × 914.24
  4. Step 4: Simplify right side
    1,385.46x = 1,747,514.91
  5. Step 5: Solve for x
    x = 1,747,514.91/1,385.46
  6. Step 6: Final answer
    x = 1,261.32

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Double scale
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1.5x scale

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.