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Finding the Fourth Proportional to 574.02, 860.10 and 390.78

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Solution

The fourth proportional to 574.02, 860.10 and 390.78 is: 585.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.02 : 860.10 = 390.78 : x
  2. Step 2: Convert to fraction form
    574.02/860.10 = 390.78/x
  3. Step 3: Cross multiply
    574.02x = 860.10 × 390.78
  4. Step 4: Simplify right side
    574.02x = 336,109.88
  5. Step 5: Solve for x
    x = 336,109.88/574.02
  6. Step 6: Final answer
    x = 585.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.