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Finding the Fourth Proportional to 383.71, 572.78 and 355.16

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Solution

The fourth proportional to 383.71, 572.78 and 355.16 is: 530.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.71 : 572.78 = 355.16 : x
  2. Step 2: Convert to fraction form
    383.71/572.78 = 355.16/x
  3. Step 3: Cross multiply
    383.71x = 572.78 × 355.16
  4. Step 4: Simplify right side
    383.71x = 203,429.43
  5. Step 5: Solve for x
    x = 203,429.43/383.71
  6. Step 6: Final answer
    x = 530.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.