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Finding the Fourth Proportional to 1,267.72, 1,901.58 and 780.94

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Solution

The fourth proportional to 1,267.72, 1,901.58 and 780.94 is: 1,171.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.72 : 1,901.58 = 780.94 : x
  2. Step 2: Convert to fraction form
    1,267.72/1,901.58 = 780.94/x
  3. Step 3: Cross multiply
    1,267.72x = 1,901.58 × 780.94
  4. Step 4: Simplify right side
    1,267.72x = 1,485,019.89
  5. Step 5: Solve for x
    x = 1,485,019.89/1,267.72
  6. Step 6: Final answer
    x = 1,171.41

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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.