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Finding the Fourth Proportional to 90,861.40, 136,437.90 and 61,409.80

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Solution

The fourth proportional to 90,861.40, 136,437.90 and 61,409.80 is: 92,213.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,861.40 : 136,437.90 = 61,409.80 : x
  2. Step 2: Convert to fraction form
    90,861.40/136,437.90 = 61,409.80/x
  3. Step 3: Cross multiply
    90,861.40x = 136,437.90 × 61,409.80
  4. Step 4: Simplify right side
    90,861.40x = 8,378,624,151.42
  5. Step 5: Solve for x
    x = 8,378,624,151.42/90,861.40
  6. Step 6: Final answer
    x = 92,213.24

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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.