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Finding the Fourth Proportional to 1,256.40, 1,884.61 and 378.91

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Solution

The fourth proportional to 1,256.40, 1,884.61 and 378.91 is: 568.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.40 : 1,884.61 = 378.91 : x
  2. Step 2: Convert to fraction form
    1,256.40/1,884.61 = 378.91/x
  3. Step 3: Cross multiply
    1,256.40x = 1,884.61 × 378.91
  4. Step 4: Simplify right side
    1,256.40x = 714,087.20
  5. Step 5: Solve for x
    x = 714,087.20/1,256.40
  6. Step 6: Final answer
    x = 568.36

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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.