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Finding the Fourth Proportional to 315.71, 435.20 and 210.61

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Solution

The fourth proportional to 315.71, 435.20 and 210.61 is: 290.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.71 : 435.20 = 210.61 : x
  2. Step 2: Convert to fraction form
    315.71/435.20 = 210.61/x
  3. Step 3: Cross multiply
    315.71x = 435.20 × 210.61
  4. Step 4: Simplify right side
    315.71x = 91,657.47
  5. Step 5: Solve for x
    x = 91,657.47/315.71
  6. Step 6: Final answer
    x = 290.32

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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.