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Finding the Fourth Proportional to 313.28, 432.43 and 215.32

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Solution

The fourth proportional to 313.28, 432.43 and 215.32 is: 297.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.28 : 432.43 = 215.32 : x
  2. Step 2: Convert to fraction form
    313.28/432.43 = 215.32/x
  3. Step 3: Cross multiply
    313.28x = 432.43 × 215.32
  4. Step 4: Simplify right side
    313.28x = 93,110.83
  5. Step 5: Solve for x
    x = 93,110.83/313.28
  6. Step 6: Final answer
    x = 297.21

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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.