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Finding the Fourth Proportional to 28,499.90, 42,745.80 and 9,780.80

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Solution

The fourth proportional to 28,499.90, 42,745.80 and 9,780.80 is: 14,669.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,499.90 : 42,745.80 = 9,780.80 : x
  2. Step 2: Convert to fraction form
    28,499.90/42,745.80 = 9,780.80/x
  3. Step 3: Cross multiply
    28,499.90x = 42,745.80 × 9,780.80
  4. Step 4: Simplify right side
    28,499.90x = 418,088,120.64
  5. Step 5: Solve for x
    x = 418,088,120.64/28,499.90
  6. Step 6: Final answer
    x = 14,669.81

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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.