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Finding the Fourth Proportional to 624.88, 862.53 and 392

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Solution

The fourth proportional to 624.88, 862.53 and 392 is: 541.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.88 : 862.53 = 392 : x
  2. Step 2: Convert to fraction form
    624.88/862.53 = 392/x
  3. Step 3: Cross multiply
    624.88x = 862.53 × 392
  4. Step 4: Simplify right side
    624.88x = 338,111.76
  5. Step 5: Solve for x
    x = 338,111.76/624.88
  6. Step 6: Final answer
    x = 541.09

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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.