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Finding the Fourth Proportional to 893.61, 1,233.21 and 520.72

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Solution

The fourth proportional to 893.61, 1,233.21 and 520.72 is: 718.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.61 : 1,233.21 = 520.72 : x
  2. Step 2: Convert to fraction form
    893.61/1,233.21 = 520.72/x
  3. Step 3: Cross multiply
    893.61x = 1,233.21 × 520.72
  4. Step 4: Simplify right side
    893.61x = 642,157.11
  5. Step 5: Solve for x
    x = 642,157.11/893.61
  6. Step 6: Final answer
    x = 718.61

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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.