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Finding the Fourth Proportional to 774.05, 1,159.72 and 644.88

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Solution

The fourth proportional to 774.05, 1,159.72 and 644.88 is: 966.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.05 : 1,159.72 = 644.88 : x
  2. Step 2: Convert to fraction form
    774.05/1,159.72 = 644.88/x
  3. Step 3: Cross multiply
    774.05x = 1,159.72 × 644.88
  4. Step 4: Simplify right side
    774.05x = 747,875.72
  5. Step 5: Solve for x
    x = 747,875.72/774.05
  6. Step 6: Final answer
    x = 966.19

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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.