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Finding the Fourth Proportional to 976.85, 1,465.28 and 919.79

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Solution

The fourth proportional to 976.85, 1,465.28 and 919.79 is: 1,379.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.85 : 1,465.28 = 919.79 : x
  2. Step 2: Convert to fraction form
    976.85/1,465.28 = 919.79/x
  3. Step 3: Cross multiply
    976.85x = 1,465.28 × 919.79
  4. Step 4: Simplify right side
    976.85x = 1,347,746.91
  5. Step 5: Solve for x
    x = 1,347,746.91/976.85
  6. Step 6: Final answer
    x = 1,379.68

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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.