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Finding the Fourth Proportional to 70,145.76, 105,219.72 and 20,230.32

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Solution

The fourth proportional to 70,145.76, 105,219.72 and 20,230.32 is: 30,345.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,145.76 : 105,219.72 = 20,230.32 : x
  2. Step 2: Convert to fraction form
    70,145.76/105,219.72 = 20,230.32/x
  3. Step 3: Cross multiply
    70,145.76x = 105,219.72 × 20,230.32
  4. Step 4: Simplify right side
    70,145.76x = 2,128,628,605.91
  5. Step 5: Solve for x
    x = 2,128,628,605.91/70,145.76
  6. Step 6: Final answer
    x = 30,345.79

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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.