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Finding the Fourth Proportional to 42,698.30, 64,019.90 and 17,755.56

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Solution

The fourth proportional to 42,698.30, 64,019.90 and 17,755.56 is: 26,621.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,698.30 : 64,019.90 = 17,755.56 : x
  2. Step 2: Convert to fraction form
    42,698.30/64,019.90 = 17,755.56/x
  3. Step 3: Cross multiply
    42,698.30x = 64,019.90 × 17,755.56
  4. Step 4: Simplify right side
    42,698.30x = 1,136,709,175.64
  5. Step 5: Solve for x
    x = 1,136,709,175.64/42,698.30
  6. Step 6: Final answer
    x = 26,621.88

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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.