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Finding the Fourth Proportional to 890.19, 1,335.39 and 305.30

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Solution

The fourth proportional to 890.19, 1,335.39 and 305.30 is: 457.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.19 : 1,335.39 = 305.30 : x
  2. Step 2: Convert to fraction form
    890.19/1,335.39 = 305.30/x
  3. Step 3: Cross multiply
    890.19x = 1,335.39 × 305.30
  4. Step 4: Simplify right side
    890.19x = 407,694.57
  5. Step 5: Solve for x
    x = 407,694.57/890.19
  6. Step 6: Final answer
    x = 457.99

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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.