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Finding the Fourth Proportional to 434.76, 651.78 and 215.16

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Solution

The fourth proportional to 434.76, 651.78 and 215.16 is: 322.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.76 : 651.78 = 215.16 : x
  2. Step 2: Convert to fraction form
    434.76/651.78 = 215.16/x
  3. Step 3: Cross multiply
    434.76x = 651.78 × 215.16
  4. Step 4: Simplify right side
    434.76x = 140,236.98
  5. Step 5: Solve for x
    x = 140,236.98/434.76
  6. Step 6: Final answer
    x = 322.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.