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Finding the Fourth Proportional to 590.51, 815.58 and 393.68

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Solution

The fourth proportional to 590.51, 815.58 and 393.68 is: 543.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.51 : 815.58 = 393.68 : x
  2. Step 2: Convert to fraction form
    590.51/815.58 = 393.68/x
  3. Step 3: Cross multiply
    590.51x = 815.58 × 393.68
  4. Step 4: Simplify right side
    590.51x = 321,073.46
  5. Step 5: Solve for x
    x = 321,073.46/590.51
  6. Step 6: Final answer
    x = 543.73

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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.