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Finding the Fourth Proportional to 355.39, 490.56 and 313.47

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Solution

The fourth proportional to 355.39, 490.56 and 313.47 is: 432.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.39 : 490.56 = 313.47 : x
  2. Step 2: Convert to fraction form
    355.39/490.56 = 313.47/x
  3. Step 3: Cross multiply
    355.39x = 490.56 × 313.47
  4. Step 4: Simplify right side
    355.39x = 153,774.67
  5. Step 5: Solve for x
    x = 153,774.67/355.39
  6. Step 6: Final answer
    x = 432.70

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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.