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Finding the Fourth Proportional to 42,991.80, 64,466.10 and 19,591.80

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Solution

The fourth proportional to 42,991.80, 64,466.10 and 19,591.80 is: 29,377.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,991.80 : 64,466.10 = 19,591.80 : x
  2. Step 2: Convert to fraction form
    42,991.80/64,466.10 = 19,591.80/x
  3. Step 3: Cross multiply
    42,991.80x = 64,466.10 × 19,591.80
  4. Step 4: Simplify right side
    42,991.80x = 1,263,006,937.98
  5. Step 5: Solve for x
    x = 1,263,006,937.98/42,991.80
  6. Step 6: Final answer
    x = 29,377.86

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1.5x scale

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.