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Finding the Fourth Proportional to 1,256.32, 1,884.28 and 434.56

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Solution

The fourth proportional to 1,256.32, 1,884.28 and 434.56 is: 651.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.32 : 1,884.28 = 434.56 : x
  2. Step 2: Convert to fraction form
    1,256.32/1,884.28 = 434.56/x
  3. Step 3: Cross multiply
    1,256.32x = 1,884.28 × 434.56
  4. Step 4: Simplify right side
    1,256.32x = 818,832.72
  5. Step 5: Solve for x
    x = 818,832.72/1,256.32
  6. Step 6: Final answer
    x = 651.77

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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.