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Finding the Fourth Proportional to 315.86, 436.26 and 243.05

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Solution

The fourth proportional to 315.86, 436.26 and 243.05 is: 335.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.86 : 436.26 = 243.05 : x
  2. Step 2: Convert to fraction form
    315.86/436.26 = 243.05/x
  3. Step 3: Cross multiply
    315.86x = 436.26 × 243.05
  4. Step 4: Simplify right side
    315.86x = 106,030.81
  5. Step 5: Solve for x
    x = 106,030.81/315.86
  6. Step 6: Final answer
    x = 335.69

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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.