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Finding the Fourth Proportional to 358, 493.76 and 279.28

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Solution

The fourth proportional to 358, 493.76 and 279.28 is: 385.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    358 : 493.76 = 279.28 : x
  2. Step 2: Convert to fraction form
    358/493.76 = 279.28/x
  3. Step 3: Cross multiply
    358x = 493.76 × 279.28
  4. Step 4: Simplify right side
    358x = 137,897.29
  5. Step 5: Solve for x
    x = 137,897.29/358
  6. Step 6: Final answer
    x = 385.19

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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.