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Finding the Fourth Proportional to 890.60, 1,334.70 and 478.85

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Solution

The fourth proportional to 890.60, 1,334.70 and 478.85 is: 717.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.60 : 1,334.70 = 478.85 : x
  2. Step 2: Convert to fraction form
    890.60/1,334.70 = 478.85/x
  3. Step 3: Cross multiply
    890.60x = 1,334.70 × 478.85
  4. Step 4: Simplify right side
    890.60x = 639,114.42
  5. Step 5: Solve for x
    x = 639,114.42/890.60
  6. Step 6: Final answer
    x = 717.63

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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.