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Finding the Fourth Proportional to 577.15, 796.16 and 390.70

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Solution

The fourth proportional to 577.15, 796.16 and 390.70 is: 538.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.15 : 796.16 = 390.70 : x
  2. Step 2: Convert to fraction form
    577.15/796.16 = 390.70/x
  3. Step 3: Cross multiply
    577.15x = 796.16 × 390.70
  4. Step 4: Simplify right side
    577.15x = 311,059.71
  5. Step 5: Solve for x
    x = 311,059.71/577.15
  6. Step 6: Final answer
    x = 538.96

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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.