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Finding the Fourth Proportional to 897.54, 1,238.38 and 687.93

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Solution

The fourth proportional to 897.54, 1,238.38 and 687.93 is: 949.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.54 : 1,238.38 = 687.93 : x
  2. Step 2: Convert to fraction form
    897.54/1,238.38 = 687.93/x
  3. Step 3: Cross multiply
    897.54x = 1,238.38 × 687.93
  4. Step 4: Simplify right side
    897.54x = 851,918.75
  5. Step 5: Solve for x
    x = 851,918.75/897.54
  6. Step 6: Final answer
    x = 949.17

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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.