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Finding the Fourth Proportional to 1,217.79, 1,826.91 and 437.81

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Solution

The fourth proportional to 1,217.79, 1,826.91 and 437.81 is: 656.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.79 : 1,826.91 = 437.81 : x
  2. Step 2: Convert to fraction form
    1,217.79/1,826.91 = 437.81/x
  3. Step 3: Cross multiply
    1,217.79x = 1,826.91 × 437.81
  4. Step 4: Simplify right side
    1,217.79x = 799,830.33
  5. Step 5: Solve for x
    x = 799,830.33/1,217.79
  6. Step 6: Final answer
    x = 656.79

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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.