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Finding the Fourth Proportional to 30,635.70, 42,283.98 and 19,311.90

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Solution

The fourth proportional to 30,635.70, 42,283.98 and 19,311.90 is: 26,654.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,635.70 : 42,283.98 = 19,311.90 : x
  2. Step 2: Convert to fraction form
    30,635.70/42,283.98 = 19,311.90/x
  3. Step 3: Cross multiply
    30,635.70x = 42,283.98 × 19,311.90
  4. Step 4: Simplify right side
    30,635.70x = 816,583,993.36
  5. Step 5: Solve for x
    x = 816,583,993.36/30,635.70
  6. Step 6: Final answer
    x = 26,654.65

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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.