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Finding the Fourth Proportional to 70,042.78, 105,064.88 and 20,122.75

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Solution

The fourth proportional to 70,042.78, 105,064.88 and 20,122.75 is: 30,184.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,042.78 : 105,064.88 = 20,122.75 : x
  2. Step 2: Convert to fraction form
    70,042.78/105,064.88 = 20,122.75/x
  3. Step 3: Cross multiply
    70,042.78x = 105,064.88 × 20,122.75
  4. Step 4: Simplify right side
    70,042.78x = 2,114,194,314.02
  5. Step 5: Solve for x
    x = 2,114,194,314.02/70,042.78
  6. Step 6: Final answer
    x = 30,184.33

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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.