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Finding the Fourth Proportional to 390.02, 585.32 and 298.89

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Solution

The fourth proportional to 390.02, 585.32 and 298.89 is: 448.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.02 : 585.32 = 298.89 : x
  2. Step 2: Convert to fraction form
    390.02/585.32 = 298.89/x
  3. Step 3: Cross multiply
    390.02x = 585.32 × 298.89
  4. Step 4: Simplify right side
    390.02x = 174,944.80
  5. Step 5: Solve for x
    x = 174,944.80/390.02
  6. Step 6: Final answer
    x = 448.56

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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.