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Finding the Fourth Proportional to 776.52, 1,163.70 and 429.12

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Solution

The fourth proportional to 776.52, 1,163.70 and 429.12 is: 643.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.52 : 1,163.70 = 429.12 : x
  2. Step 2: Convert to fraction form
    776.52/1,163.70 = 429.12/x
  3. Step 3: Cross multiply
    776.52x = 1,163.70 × 429.12
  4. Step 4: Simplify right side
    776.52x = 499,366.94
  5. Step 5: Solve for x
    x = 499,366.94/776.52
  6. Step 6: Final answer
    x = 643.08

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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.