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Finding the Fourth Proportional to 590.99, 815.60 and 391.47

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Solution

The fourth proportional to 590.99, 815.60 and 391.47 is: 540.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.99 : 815.60 = 391.47 : x
  2. Step 2: Convert to fraction form
    590.99/815.60 = 391.47/x
  3. Step 3: Cross multiply
    590.99x = 815.60 × 391.47
  4. Step 4: Simplify right side
    590.99x = 319,282.44
  5. Step 5: Solve for x
    x = 319,282.44/590.99
  6. Step 6: Final answer
    x = 540.25

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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.