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Finding the Fourth Proportional to 522.88, 782.16 and 399.76

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Solution

The fourth proportional to 522.88, 782.16 and 399.76 is: 597.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.88 : 782.16 = 399.76 : x
  2. Step 2: Convert to fraction form
    522.88/782.16 = 399.76/x
  3. Step 3: Cross multiply
    522.88x = 782.16 × 399.76
  4. Step 4: Simplify right side
    522.88x = 312,676.28
  5. Step 5: Solve for x
    x = 312,676.28/522.88
  6. Step 6: Final answer
    x = 597.99

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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.