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Finding the Fourth Proportional to 897.28, 1,236.54 and 648.15

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Solution

The fourth proportional to 897.28, 1,236.54 and 648.15 is: 893.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.28 : 1,236.54 = 648.15 : x
  2. Step 2: Convert to fraction form
    897.28/1,236.54 = 648.15/x
  3. Step 3: Cross multiply
    897.28x = 1,236.54 × 648.15
  4. Step 4: Simplify right side
    897.28x = 801,463.40
  5. Step 5: Solve for x
    x = 801,463.40/897.28
  6. Step 6: Final answer
    x = 893.21

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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.