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Finding the Fourth Proportional to 890.26, 1,335.12 and 313

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Solution

The fourth proportional to 890.26, 1,335.12 and 313 is: 469.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.26 : 1,335.12 = 313 : x
  2. Step 2: Convert to fraction form
    890.26/1,335.12 = 313/x
  3. Step 3: Cross multiply
    890.26x = 1,335.12 × 313
  4. Step 4: Simplify right side
    890.26x = 417,892.56
  5. Step 5: Solve for x
    x = 417,892.56/890.26
  6. Step 6: Final answer
    x = 469.41

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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.