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Finding the Fourth Proportional to 582.38, 803.36 and 390.79

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Solution

The fourth proportional to 582.38, 803.36 and 390.79 is: 539.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    582.38 : 803.36 = 390.79 : x
  2. Step 2: Convert to fraction form
    582.38/803.36 = 390.79/x
  3. Step 3: Cross multiply
    582.38x = 803.36 × 390.79
  4. Step 4: Simplify right side
    582.38x = 313,944.02
  5. Step 5: Solve for x
    x = 313,944.02/582.38
  6. Step 6: Final answer
    x = 539.08

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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.