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Finding the Fourth Proportional to 1,777, 2,666.14 and 1,289.20

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Solution

The fourth proportional to 1,777, 2,666.14 and 1,289.20 is: 1,934.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,777 : 2,666.14 = 1,289.20 : x
  2. Step 2: Convert to fraction form
    1,777/2,666.14 = 1,289.20/x
  3. Step 3: Cross multiply
    1,777x = 2,666.14 × 1,289.20
  4. Step 4: Simplify right side
    1,777x = 3,437,187.69
  5. Step 5: Solve for x
    x = 3,437,187.69/1,777
  6. Step 6: Final answer
    x = 1,934.26

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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.