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Finding the Fourth Proportional to 914.44, 1,372.35 and 638.74

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Solution

The fourth proportional to 914.44, 1,372.35 and 638.74 is: 958.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.44 : 1,372.35 = 638.74 : x
  2. Step 2: Convert to fraction form
    914.44/1,372.35 = 638.74/x
  3. Step 3: Cross multiply
    914.44x = 1,372.35 × 638.74
  4. Step 4: Simplify right side
    914.44x = 876,574.84
  5. Step 5: Solve for x
    x = 876,574.84/914.44
  6. Step 6: Final answer
    x = 958.59

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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.