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Finding the Fourth Proportional to 315.09, 434.21 and 210.06

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Solution

The fourth proportional to 315.09, 434.21 and 210.06 is: 289.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.09 : 434.21 = 210.06 : x
  2. Step 2: Convert to fraction form
    315.09/434.21 = 210.06/x
  3. Step 3: Cross multiply
    315.09x = 434.21 × 210.06
  4. Step 4: Simplify right side
    315.09x = 91,210.15
  5. Step 5: Solve for x
    x = 91,210.15/315.09
  6. Step 6: Final answer
    x = 289.47

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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.