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Finding the Fourth Proportional to 70,421.43, 105,649.45 and 20,501.96

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Solution

The fourth proportional to 70,421.43, 105,649.45 and 20,501.96 is: 30,757.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,421.43 : 105,649.45 = 20,501.96 : x
  2. Step 2: Convert to fraction form
    70,421.43/105,649.45 = 20,501.96/x
  3. Step 3: Cross multiply
    70,421.43x = 105,649.45 × 20,501.96
  4. Step 4: Simplify right side
    70,421.43x = 2,166,020,797.92
  5. Step 5: Solve for x
    x = 2,166,020,797.92/70,421.43
  6. Step 6: Final answer
    x = 30,757.98

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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.