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Finding the Fourth Proportional to 521.88, 785.43 and 392.55

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Solution

The fourth proportional to 521.88, 785.43 and 392.55 is: 590.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.88 : 785.43 = 392.55 : x
  2. Step 2: Convert to fraction form
    521.88/785.43 = 392.55/x
  3. Step 3: Cross multiply
    521.88x = 785.43 × 392.55
  4. Step 4: Simplify right side
    521.88x = 308,319.07
  5. Step 5: Solve for x
    x = 308,319.07/521.88
  6. Step 6: Final answer
    x = 590.79

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.