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Finding the Fourth Proportional to 565.14, 779.67 and 390.54

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Solution

The fourth proportional to 565.14, 779.67 and 390.54 is: 538.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.14 : 779.67 = 390.54 : x
  2. Step 2: Convert to fraction form
    565.14/779.67 = 390.54/x
  3. Step 3: Cross multiply
    565.14x = 779.67 × 390.54
  4. Step 4: Simplify right side
    565.14x = 304,492.32
  5. Step 5: Solve for x
    x = 304,492.32/565.14
  6. Step 6: Final answer
    x = 538.79

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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.