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Finding the Fourth Proportional to 70,242.76, 105,348.36 and 20,311.72

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Solution

The fourth proportional to 70,242.76, 105,348.36 and 20,311.72 is: 30,463.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,242.76 : 105,348.36 = 20,311.72 : x
  2. Step 2: Convert to fraction form
    70,242.76/105,348.36 = 20,311.72/x
  3. Step 3: Cross multiply
    70,242.76x = 105,348.36 × 20,311.72
  4. Step 4: Simplify right side
    70,242.76x = 2,139,806,390.78
  5. Step 5: Solve for x
    x = 2,139,806,390.78/70,242.76
  6. Step 6: Final answer
    x = 30,463.02

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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.