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Finding the Fourth Proportional to 571.10, 787.66 and 384.80

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Solution

The fourth proportional to 571.10, 787.66 and 384.80 is: 530.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.10 : 787.66 = 384.80 : x
  2. Step 2: Convert to fraction form
    571.10/787.66 = 384.80/x
  3. Step 3: Cross multiply
    571.10x = 787.66 × 384.80
  4. Step 4: Simplify right side
    571.10x = 303,086.67
  5. Step 5: Solve for x
    x = 303,086.67/571.10
  6. Step 6: Final answer
    x = 530.71

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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.