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Finding the Fourth Proportional to 897.56, 1,238.84 and 666.44

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Solution

The fourth proportional to 897.56, 1,238.84 and 666.44 is: 919.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.56 : 1,238.84 = 666.44 : x
  2. Step 2: Convert to fraction form
    897.56/1,238.84 = 666.44/x
  3. Step 3: Cross multiply
    897.56x = 1,238.84 × 666.44
  4. Step 4: Simplify right side
    897.56x = 825,612.53
  5. Step 5: Solve for x
    x = 825,612.53/897.56
  6. Step 6: Final answer
    x = 919.84

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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.