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Finding the Fourth Proportional to 824.36, 1,139.06 and 648.72

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Solution

The fourth proportional to 824.36, 1,139.06 and 648.72 is: 896.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.36 : 1,139.06 = 648.72 : x
  2. Step 2: Convert to fraction form
    824.36/1,139.06 = 648.72/x
  3. Step 3: Cross multiply
    824.36x = 1,139.06 × 648.72
  4. Step 4: Simplify right side
    824.36x = 738,927.60
  5. Step 5: Solve for x
    x = 738,927.60/824.36
  6. Step 6: Final answer
    x = 896.36

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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.