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Finding the Fourth Proportional to 1,256.40, 1,884.84 and 434.80

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Solution

The fourth proportional to 1,256.40, 1,884.84 and 434.80 is: 652.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.40 : 1,884.84 = 434.80 : x
  2. Step 2: Convert to fraction form
    1,256.40/1,884.84 = 434.80/x
  3. Step 3: Cross multiply
    1,256.40x = 1,884.84 × 434.80
  4. Step 4: Simplify right side
    1,256.40x = 819,528.43
  5. Step 5: Solve for x
    x = 819,528.43/1,256.40
  6. Step 6: Final answer
    x = 652.28

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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.