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Finding the Fourth Proportional to 1,256.28, 1,884.50 and 378.74

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Solution

The fourth proportional to 1,256.28, 1,884.50 and 378.74 is: 568.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.28 : 1,884.50 = 378.74 : x
  2. Step 2: Convert to fraction form
    1,256.28/1,884.50 = 378.74/x
  3. Step 3: Cross multiply
    1,256.28x = 1,884.50 × 378.74
  4. Step 4: Simplify right side
    1,256.28x = 713,739.77
  5. Step 5: Solve for x
    x = 713,739.77/1,256.28
  6. Step 6: Final answer
    x = 568.14

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.