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Finding the Fourth Proportional to 890.15, 1,335.40 and 403.21

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Solution

The fourth proportional to 890.15, 1,335.40 and 403.21 is: 604.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.15 : 1,335.40 = 403.21 : x
  2. Step 2: Convert to fraction form
    890.15/1,335.40 = 403.21/x
  3. Step 3: Cross multiply
    890.15x = 1,335.40 × 403.21
  4. Step 4: Simplify right side
    890.15x = 538,446.63
  5. Step 5: Solve for x
    x = 538,446.63/890.15
  6. Step 6: Final answer
    x = 604.89

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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.