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Finding the Fourth Proportional to 535.90, 803.85 and 319.90

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Solution

The fourth proportional to 535.90, 803.85 and 319.90 is: 479.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.90 : 803.85 = 319.90 : x
  2. Step 2: Convert to fraction form
    535.90/803.85 = 319.90/x
  3. Step 3: Cross multiply
    535.90x = 803.85 × 319.90
  4. Step 4: Simplify right side
    535.90x = 257,151.62
  5. Step 5: Solve for x
    x = 257,151.62/535.90
  6. Step 6: Final answer
    x = 479.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.