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Finding the Fourth Proportional to 70,345.95, 105,524.39 and 20,426.87

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Solution

The fourth proportional to 70,345.95, 105,524.39 and 20,426.87 is: 30,641.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,345.95 : 105,524.39 = 20,426.87 : x
  2. Step 2: Convert to fraction form
    70,345.95/105,524.39 = 20,426.87/x
  3. Step 3: Cross multiply
    70,345.95x = 105,524.39 × 20,426.87
  4. Step 4: Simplify right side
    70,345.95x = 2,155,532,996.36
  5. Step 5: Solve for x
    x = 2,155,532,996.36/70,345.95
  6. Step 6: Final answer
    x = 30,641.89

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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.