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Finding the Fourth Proportional to 1,256.80, 1,884.64 and 486.76

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Solution

The fourth proportional to 1,256.80, 1,884.64 and 486.76 is: 729.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.80 : 1,884.64 = 486.76 : x
  2. Step 2: Convert to fraction form
    1,256.80/1,884.64 = 486.76/x
  3. Step 3: Cross multiply
    1,256.80x = 1,884.64 × 486.76
  4. Step 4: Simplify right side
    1,256.80x = 917,367.37
  5. Step 5: Solve for x
    x = 917,367.37/1,256.80
  6. Step 6: Final answer
    x = 729.92

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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.