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Finding the Fourth Proportional to 70,074.90, 105,129.77 and 20,158.33

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Solution

The fourth proportional to 70,074.90, 105,129.77 and 20,158.33 is: 30,242.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,074.90 : 105,129.77 = 20,158.33 : x
  2. Step 2: Convert to fraction form
    70,074.90/105,129.77 = 20,158.33/x
  3. Step 3: Cross multiply
    70,074.90x = 105,129.77 × 20,158.33
  4. Step 4: Simplify right side
    70,074.90x = 2,119,240,747.91
  5. Step 5: Solve for x
    x = 2,119,240,747.91/70,074.90
  6. Step 6: Final answer
    x = 30,242.51

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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.