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Finding the Fourth Proportional to 70,060.80, 105,060.16 and 20,129.60

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Solution

The fourth proportional to 70,060.80, 105,060.16 and 20,129.60 is: 30,185.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,060.80 : 105,060.16 = 20,129.60 : x
  2. Step 2: Convert to fraction form
    70,060.80/105,060.16 = 20,129.60/x
  3. Step 3: Cross multiply
    70,060.80x = 105,060.16 × 20,129.60
  4. Step 4: Simplify right side
    70,060.80x = 2,114,818,996.74
  5. Step 5: Solve for x
    x = 2,114,818,996.74/70,060.80
  6. Step 6: Final answer
    x = 30,185.48

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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.