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Finding the Fourth Proportional to 889.68, 1,333.52 and 426.80

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Solution

The fourth proportional to 889.68, 1,333.52 and 426.80 is: 639.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.68 : 1,333.52 = 426.80 : x
  2. Step 2: Convert to fraction form
    889.68/1,333.52 = 426.80/x
  3. Step 3: Cross multiply
    889.68x = 1,333.52 × 426.80
  4. Step 4: Simplify right side
    889.68x = 569,146.34
  5. Step 5: Solve for x
    x = 569,146.34/889.68
  6. Step 6: Final answer
    x = 639.72

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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.