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Finding the Fourth Proportional to 1,772.21, 2,658.91 and 784.89

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Solution

The fourth proportional to 1,772.21, 2,658.91 and 784.89 is: 1,177.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,772.21 : 2,658.91 = 784.89 : x
  2. Step 2: Convert to fraction form
    1,772.21/2,658.91 = 784.89/x
  3. Step 3: Cross multiply
    1,772.21x = 2,658.91 × 784.89
  4. Step 4: Simplify right side
    1,772.21x = 2,086,954.69
  5. Step 5: Solve for x
    x = 2,086,954.69/1,772.21
  6. Step 6: Final answer
    x = 1,177.60

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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.