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Finding the Fourth Proportional to 28,490.54, 42,739.86 and 8,770.74

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Solution

The fourth proportional to 28,490.54, 42,739.86 and 8,770.74 is: 13,157.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,490.54 : 42,739.86 = 8,770.74 : x
  2. Step 2: Convert to fraction form
    28,490.54/42,739.86 = 8,770.74/x
  3. Step 3: Cross multiply
    28,490.54x = 42,739.86 × 8,770.74
  4. Step 4: Simplify right side
    28,490.54x = 374,860,199.70
  5. Step 5: Solve for x
    x = 374,860,199.70/28,490.54
  6. Step 6: Final answer
    x = 13,157.36

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1.5x scale

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.