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Finding the Fourth Proportional to 1,274.72, 1,758.21 and 896

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Solution

The fourth proportional to 1,274.72, 1,758.21 and 896 is: 1,235.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.72 : 1,758.21 = 896 : x
  2. Step 2: Convert to fraction form
    1,274.72/1,758.21 = 896/x
  3. Step 3: Cross multiply
    1,274.72x = 1,758.21 × 896
  4. Step 4: Simplify right side
    1,274.72x = 1,575,356.16
  5. Step 5: Solve for x
    x = 1,575,356.16/1,274.72
  6. Step 6: Final answer
    x = 1,235.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.