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Finding the Fourth Proportional to 403.87, 557.55 and 285.94

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Solution

The fourth proportional to 403.87, 557.55 and 285.94 is: 394.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.87 : 557.55 = 285.94 : x
  2. Step 2: Convert to fraction form
    403.87/557.55 = 285.94/x
  3. Step 3: Cross multiply
    403.87x = 557.55 × 285.94
  4. Step 4: Simplify right side
    403.87x = 159,423.74
  5. Step 5: Solve for x
    x = 159,423.74/403.87
  6. Step 6: Final answer
    x = 394.74

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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.