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Finding the Fourth Proportional to 70,861.60, 106,330.80 and 31,424.80

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Solution

The fourth proportional to 70,861.60, 106,330.80 and 31,424.80 is: 47,154.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,861.60 : 106,330.80 = 31,424.80 : x
  2. Step 2: Convert to fraction form
    70,861.60/106,330.80 = 31,424.80/x
  3. Step 3: Cross multiply
    70,861.60x = 106,330.80 × 31,424.80
  4. Step 4: Simplify right side
    70,861.60x = 3,341,424,123.84
  5. Step 5: Solve for x
    x = 3,341,424,123.84/70,861.60
  6. Step 6: Final answer
    x = 47,154.23

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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.