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Finding the Fourth Proportional to 403.34, 557.97 and 388.76

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Solution

The fourth proportional to 403.34, 557.97 and 388.76 is: 537.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.34 : 557.97 = 388.76 : x
  2. Step 2: Convert to fraction form
    403.34/557.97 = 388.76/x
  3. Step 3: Cross multiply
    403.34x = 557.97 × 388.76
  4. Step 4: Simplify right side
    403.34x = 216,916.42
  5. Step 5: Solve for x
    x = 216,916.42/403.34
  6. Step 6: Final answer
    x = 537.80

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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.