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Finding the Fourth Proportional to 380.74, 569.88 and 215.76

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Solution

The fourth proportional to 380.74, 569.88 and 215.76 is: 322.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.74 : 569.88 = 215.76 : x
  2. Step 2: Convert to fraction form
    380.74/569.88 = 215.76/x
  3. Step 3: Cross multiply
    380.74x = 569.88 × 215.76
  4. Step 4: Simplify right side
    380.74x = 122,957.31
  5. Step 5: Solve for x
    x = 122,957.31/380.74
  6. Step 6: Final answer
    x = 322.94

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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.