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Finding the Fourth Proportional to 390.24, 585.60 and 295.20

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Solution

The fourth proportional to 390.24, 585.60 and 295.20 is: 442.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.24 : 585.60 = 295.20 : x
  2. Step 2: Convert to fraction form
    390.24/585.60 = 295.20/x
  3. Step 3: Cross multiply
    390.24x = 585.60 × 295.20
  4. Step 4: Simplify right side
    390.24x = 172,869.12
  5. Step 5: Solve for x
    x = 172,869.12/390.24
  6. Step 6: Final answer
    x = 442.98

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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.