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Finding the Fourth Proportional to 101,931.60, 152,800.20 and 79,429.80

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Solution

The fourth proportional to 101,931.60, 152,800.20 and 79,429.80 is: 119,068.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,931.60 : 152,800.20 = 79,429.80 : x
  2. Step 2: Convert to fraction form
    101,931.60/152,800.20 = 79,429.80/x
  3. Step 3: Cross multiply
    101,931.60x = 152,800.20 × 79,429.80
  4. Step 4: Simplify right side
    101,931.60x = 12,136,889,325.96
  5. Step 5: Solve for x
    x = 12,136,889,325.96/101,931.60
  6. Step 6: Final answer
    x = 119,068.96

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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.