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Finding the Fourth Proportional to 776.19, 1,164.48 and 429.81

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Solution

The fourth proportional to 776.19, 1,164.48 and 429.81 is: 644.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.19 : 1,164.48 = 429.81 : x
  2. Step 2: Convert to fraction form
    776.19/1,164.48 = 429.81/x
  3. Step 3: Cross multiply
    776.19x = 1,164.48 × 429.81
  4. Step 4: Simplify right side
    776.19x = 500,505.15
  5. Step 5: Solve for x
    x = 500,505.15/776.19
  6. Step 6: Final answer
    x = 644.82

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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.