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Finding the Fourth Proportional to 929.75, 1,392.39 and 776.66

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Solution

The fourth proportional to 929.75, 1,392.39 and 776.66 is: 1,163.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.75 : 1,392.39 = 776.66 : x
  2. Step 2: Convert to fraction form
    929.75/1,392.39 = 776.66/x
  3. Step 3: Cross multiply
    929.75x = 1,392.39 × 776.66
  4. Step 4: Simplify right side
    929.75x = 1,081,406.66
  5. Step 5: Solve for x
    x = 1,081,406.66/929.75
  6. Step 6: Final answer
    x = 1,163.12

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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.