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Finding the Fourth Proportional to 881.43, 1,216.61 and 549.66

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Solution

The fourth proportional to 881.43, 1,216.61 and 549.66 is: 758.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.43 : 1,216.61 = 549.66 : x
  2. Step 2: Convert to fraction form
    881.43/1,216.61 = 549.66/x
  3. Step 3: Cross multiply
    881.43x = 1,216.61 × 549.66
  4. Step 4: Simplify right side
    881.43x = 668,715.77
  5. Step 5: Solve for x
    x = 668,715.77/881.43
  6. Step 6: Final answer
    x = 758.67

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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.