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Finding the Fourth Proportional to 521.69, 785.15 and 392.36

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Solution

The fourth proportional to 521.69, 785.15 and 392.36 is: 590.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.69 : 785.15 = 392.36 : x
  2. Step 2: Convert to fraction form
    521.69/785.15 = 392.36/x
  3. Step 3: Cross multiply
    521.69x = 785.15 × 392.36
  4. Step 4: Simplify right side
    521.69x = 308,060.72
  5. Step 5: Solve for x
    x = 308,060.72/521.69
  6. Step 6: Final answer
    x = 590.51

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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.