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Finding the Fourth Proportional to 437.90, 656.84 and 315.79

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Solution

The fourth proportional to 437.90, 656.84 and 315.79 is: 473.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.90 : 656.84 = 315.79 : x
  2. Step 2: Convert to fraction form
    437.90/656.84 = 315.79/x
  3. Step 3: Cross multiply
    437.90x = 656.84 × 315.79
  4. Step 4: Simplify right side
    437.90x = 207,422.65
  5. Step 5: Solve for x
    x = 207,422.65/437.90
  6. Step 6: Final answer
    x = 473.68

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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.