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Finding the Fourth Proportional to 34,687.40, 47,868.90 and 20,355.80

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Solution

The fourth proportional to 34,687.40, 47,868.90 and 20,355.80 is: 28,091.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    34,687.40 : 47,868.90 = 20,355.80 : x
  2. Step 2: Convert to fraction form
    34,687.40/47,868.90 = 20,355.80/x
  3. Step 3: Cross multiply
    34,687.40x = 47,868.90 × 20,355.80
  4. Step 4: Simplify right side
    34,687.40x = 974,409,754.62
  5. Step 5: Solve for x
    x = 974,409,754.62/34,687.40
  6. Step 6: Final answer
    x = 28,091.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.