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Finding the Fourth Proportional to 358.76, 493.90 and 309.36

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Solution

The fourth proportional to 358.76, 493.90 and 309.36 is: 425.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.76 : 493.90 = 309.36 : x
  2. Step 2: Convert to fraction form
    358.76/493.90 = 309.36/x
  3. Step 3: Cross multiply
    358.76x = 493.90 × 309.36
  4. Step 4: Simplify right side
    358.76x = 152,792.90
  5. Step 5: Solve for x
    x = 152,792.90/358.76
  6. Step 6: Final answer
    x = 425.89

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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.