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Finding the Fourth Proportional to 890.43, 1,335.39 and 342.21

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Solution

The fourth proportional to 890.43, 1,335.39 and 342.21 is: 513.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.43 : 1,335.39 = 342.21 : x
  2. Step 2: Convert to fraction form
    890.43/1,335.39 = 342.21/x
  3. Step 3: Cross multiply
    890.43x = 1,335.39 × 342.21
  4. Step 4: Simplify right side
    890.43x = 456,980.02
  5. Step 5: Solve for x
    x = 456,980.02/890.43
  6. Step 6: Final answer
    x = 513.21

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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.