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Finding the Fourth Proportional to 776.96, 1,165.45 and 289.91

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Solution

The fourth proportional to 776.96, 1,165.45 and 289.91 is: 434.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.96 : 1,165.45 = 289.91 : x
  2. Step 2: Convert to fraction form
    776.96/1,165.45 = 289.91/x
  3. Step 3: Cross multiply
    776.96x = 1,165.45 × 289.91
  4. Step 4: Simplify right side
    776.96x = 337,875.61
  5. Step 5: Solve for x
    x = 337,875.61/776.96
  6. Step 6: Final answer
    x = 434.87

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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.