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Finding the Fourth Proportional to 565.44, 780.12 and 390.48

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Solution

The fourth proportional to 565.44, 780.12 and 390.48 is: 538.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.44 : 780.12 = 390.48 : x
  2. Step 2: Convert to fraction form
    565.44/780.12 = 390.48/x
  3. Step 3: Cross multiply
    565.44x = 780.12 × 390.48
  4. Step 4: Simplify right side
    565.44x = 304,621.26
  5. Step 5: Solve for x
    x = 304,621.26/565.44
  6. Step 6: Final answer
    x = 538.73

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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.