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Finding the Fourth Proportional to 577.81, 797.40 and 315.85

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Solution

The fourth proportional to 577.81, 797.40 and 315.85 is: 435.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.81 : 797.40 = 315.85 : x
  2. Step 2: Convert to fraction form
    577.81/797.40 = 315.85/x
  3. Step 3: Cross multiply
    577.81x = 797.40 × 315.85
  4. Step 4: Simplify right side
    577.81x = 251,858.79
  5. Step 5: Solve for x
    x = 251,858.79/577.81
  6. Step 6: Final answer
    x = 435.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.