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Finding the Fourth Proportional to 399.22, 598.82 and 390.10

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Solution

The fourth proportional to 399.22, 598.82 and 390.10 is: 585.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.22 : 598.82 = 390.10 : x
  2. Step 2: Convert to fraction form
    399.22/598.82 = 390.10/x
  3. Step 3: Cross multiply
    399.22x = 598.82 × 390.10
  4. Step 4: Simplify right side
    399.22x = 233,599.68
  5. Step 5: Solve for x
    x = 233,599.68/399.22
  6. Step 6: Final answer
    x = 585.14

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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.