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Finding the Fourth Proportional to 30,890.80, 42,627.90 and 17,279.56

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Solution

The fourth proportional to 30,890.80, 42,627.90 and 17,279.56 is: 23,845.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,890.80 : 42,627.90 = 17,279.56 : x
  2. Step 2: Convert to fraction form
    30,890.80/42,627.90 = 17,279.56/x
  3. Step 3: Cross multiply
    30,890.80x = 42,627.90 × 17,279.56
  4. Step 4: Simplify right side
    30,890.80x = 736,591,355.72
  5. Step 5: Solve for x
    x = 736,591,355.72/30,890.80
  6. Step 6: Final answer
    x = 23,845.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.