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Finding the Fourth Proportional to 597, 823.86 and 390

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Solution

The fourth proportional to 597, 823.86 and 390 is: 538.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    597 : 823.86 = 390 : x
  2. Step 2: Convert to fraction form
    597/823.86 = 390/x
  3. Step 3: Cross multiply
    597x = 823.86 × 390
  4. Step 4: Simplify right side
    597x = 321,305.40
  5. Step 5: Solve for x
    x = 321,305.40/597
  6. Step 6: Final answer
    x = 538.20

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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.