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Finding the Fourth Proportional to 315.36, 434.86 and 215.72

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Solution

The fourth proportional to 315.36, 434.86 and 215.72 is: 297.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.36 : 434.86 = 215.72 : x
  2. Step 2: Convert to fraction form
    315.36/434.86 = 215.72/x
  3. Step 3: Cross multiply
    315.36x = 434.86 × 215.72
  4. Step 4: Simplify right side
    315.36x = 93,808.00
  5. Step 5: Solve for x
    x = 93,808.00/315.36
  6. Step 6: Final answer
    x = 297.46

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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.