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Finding the Fourth Proportional to 358, 494.15 and 288.30

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Solution

The fourth proportional to 358, 494.15 and 288.30 is: 397.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    358 : 494.15 = 288.30 : x
  2. Step 2: Convert to fraction form
    358/494.15 = 288.30/x
  3. Step 3: Cross multiply
    358x = 494.15 × 288.30
  4. Step 4: Simplify right side
    358x = 142,463.45
  5. Step 5: Solve for x
    x = 142,463.45/358
  6. Step 6: Final answer
    x = 397.94

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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.