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Finding the Fourth Proportional to 577.51, 797.18 and 391.42

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Solution

The fourth proportional to 577.51, 797.18 and 391.42 is: 540.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.51 : 797.18 = 391.42 : x
  2. Step 2: Convert to fraction form
    577.51/797.18 = 391.42/x
  3. Step 3: Cross multiply
    577.51x = 797.18 × 391.42
  4. Step 4: Simplify right side
    577.51x = 312,026.25
  5. Step 5: Solve for x
    x = 312,026.25/577.51
  6. Step 6: Final answer
    x = 540.30

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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.