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Finding the Fourth Proportional to 70,139.76, 105,210.72 and 20,224.32

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Solution

The fourth proportional to 70,139.76, 105,210.72 and 20,224.32 is: 30,336.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,139.76 : 105,210.72 = 20,224.32 : x
  2. Step 2: Convert to fraction form
    70,139.76/105,210.72 = 20,224.32/x
  3. Step 3: Cross multiply
    70,139.76x = 105,210.72 × 20,224.32
  4. Step 4: Simplify right side
    70,139.76x = 2,127,815,268.71
  5. Step 5: Solve for x
    x = 2,127,815,268.71/70,139.76
  6. Step 6: Final answer
    x = 30,336.79

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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.