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Finding the Fourth Proportional to 70,400.28, 105,595.14 and 20,480.76

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Solution

The fourth proportional to 70,400.28, 105,595.14 and 20,480.76 is: 30,719.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,400.28 : 105,595.14 = 20,480.76 : x
  2. Step 2: Convert to fraction form
    70,400.28/105,595.14 = 20,480.76/x
  3. Step 3: Cross multiply
    70,400.28x = 105,595.14 × 20,480.76
  4. Step 4: Simplify right side
    70,400.28x = 2,162,668,719.51
  5. Step 5: Solve for x
    x = 2,162,668,719.51/70,400.28
  6. Step 6: Final answer
    x = 30,719.60

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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.