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Finding the Fourth Proportional to 890.54, 1,335.80 and 313.28

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Solution

The fourth proportional to 890.54, 1,335.80 and 313.28 is: 469.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.54 : 1,335.80 = 313.28 : x
  2. Step 2: Convert to fraction form
    890.54/1,335.80 = 313.28/x
  3. Step 3: Cross multiply
    890.54x = 1,335.80 × 313.28
  4. Step 4: Simplify right side
    890.54x = 418,473.53
  5. Step 5: Solve for x
    x = 418,473.53/890.54
  6. Step 6: Final answer
    x = 469.91

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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.