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Finding the Fourth Proportional to 28,108.80, 42,114.60 and 13,285.80

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Solution

The fourth proportional to 28,108.80, 42,114.60 and 13,285.80 is: 19,905.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,108.80 : 42,114.60 = 13,285.80 : x
  2. Step 2: Convert to fraction form
    28,108.80/42,114.60 = 13,285.80/x
  3. Step 3: Cross multiply
    28,108.80x = 42,114.60 × 13,285.80
  4. Step 4: Simplify right side
    28,108.80x = 559,526,152.68
  5. Step 5: Solve for x
    x = 559,526,152.68/28,108.80
  6. Step 6: Final answer
    x = 19,905.73

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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.