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Finding the Fourth Proportional to 851.81, 1,277.21 and 456.71

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Solution

The fourth proportional to 851.81, 1,277.21 and 456.71 is: 684.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.81 : 1,277.21 = 456.71 : x
  2. Step 2: Convert to fraction form
    851.81/1,277.21 = 456.71/x
  3. Step 3: Cross multiply
    851.81x = 1,277.21 × 456.71
  4. Step 4: Simplify right side
    851.81x = 583,309.10
  5. Step 5: Solve for x
    x = 583,309.10/851.81
  6. Step 6: Final answer
    x = 684.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.