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Finding the Fourth Proportional to 896.72, 1,239.03 and 648.86

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Solution

The fourth proportional to 896.72, 1,239.03 and 648.86 is: 896.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.72 : 1,239.03 = 648.86 : x
  2. Step 2: Convert to fraction form
    896.72/1,239.03 = 648.86/x
  3. Step 3: Cross multiply
    896.72x = 1,239.03 × 648.86
  4. Step 4: Simplify right side
    896.72x = 803,950.81
  5. Step 5: Solve for x
    x = 803,950.81/896.72
  6. Step 6: Final answer
    x = 896.55

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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.