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Finding the Fourth Proportional to 890.80, 1,336.91 and 403.89

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Solution

The fourth proportional to 890.80, 1,336.91 and 403.89 is: 606.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.80 : 1,336.91 = 403.89 : x
  2. Step 2: Convert to fraction form
    890.80/1,336.91 = 403.89/x
  3. Step 3: Cross multiply
    890.80x = 1,336.91 × 403.89
  4. Step 4: Simplify right side
    890.80x = 539,957.55
  5. Step 5: Solve for x
    x = 539,957.55/890.80
  6. Step 6: Final answer
    x = 606.15

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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.