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Finding the Fourth Proportional to 1,274.67, 1,758.75 and 921.11

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Solution

The fourth proportional to 1,274.67, 1,758.75 and 921.11 is: 1,270.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.67 : 1,758.75 = 921.11 : x
  2. Step 2: Convert to fraction form
    1,274.67/1,758.75 = 921.11/x
  3. Step 3: Cross multiply
    1,274.67x = 1,758.75 × 921.11
  4. Step 4: Simplify right side
    1,274.67x = 1,619,993.42
  5. Step 5: Solve for x
    x = 1,619,993.42/1,274.67
  6. Step 6: Final answer
    x = 1,270.91

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Half scale
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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.