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Finding the Fourth Proportional to 1,256.56, 1,884.81 and 434.78

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Solution

The fourth proportional to 1,256.56, 1,884.81 and 434.78 is: 652.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.56 : 1,884.81 = 434.78 : x
  2. Step 2: Convert to fraction form
    1,256.56/1,884.81 = 434.78/x
  3. Step 3: Cross multiply
    1,256.56x = 1,884.81 × 434.78
  4. Step 4: Simplify right side
    1,256.56x = 819,476.56
  5. Step 5: Solve for x
    x = 819,476.56/1,256.56
  6. Step 6: Final answer
    x = 652.16

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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.