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Finding the Fourth Proportional to 890.85, 1,335.49 and 479.50

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Solution

The fourth proportional to 890.85, 1,335.49 and 479.50 is: 718.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.85 : 1,335.49 = 479.50 : x
  2. Step 2: Convert to fraction form
    890.85/1,335.49 = 479.50/x
  3. Step 3: Cross multiply
    890.85x = 1,335.49 × 479.50
  4. Step 4: Simplify right side
    890.85x = 640,370.43
  5. Step 5: Solve for x
    x = 640,370.43/890.85
  6. Step 6: Final answer
    x = 718.83

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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.