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Finding the Fourth Proportional to 42,716.80, 64,086.40 and 16,422.40

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Solution

The fourth proportional to 42,716.80, 64,086.40 and 16,422.40 is: 24,637.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,716.80 : 64,086.40 = 16,422.40 : x
  2. Step 2: Convert to fraction form
    42,716.80/64,086.40 = 16,422.40/x
  3. Step 3: Cross multiply
    42,716.80x = 64,086.40 × 16,422.40
  4. Step 4: Simplify right side
    42,716.80x = 1,052,452,495.36
  5. Step 5: Solve for x
    x = 1,052,452,495.36/42,716.80
  6. Step 6: Final answer
    x = 24,637.91

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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.