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Finding the Fourth Proportional to 524.85, 784.90 and 393.18

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Solution

The fourth proportional to 524.85, 784.90 and 393.18 is: 587.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    524.85 : 784.90 = 393.18 : x
  2. Step 2: Convert to fraction form
    524.85/784.90 = 393.18/x
  3. Step 3: Cross multiply
    524.85x = 784.90 × 393.18
  4. Step 4: Simplify right side
    524.85x = 308,604.53
  5. Step 5: Solve for x
    x = 308,604.53/524.85
  6. Step 6: Final answer
    x = 587.99

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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.