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Finding the Fourth Proportional to 42,653.88, 63,989.64 and 14,571.72

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Solution

The fourth proportional to 42,653.88, 63,989.64 and 14,571.72 is: 21,860.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,653.88 : 63,989.64 = 14,571.72 : x
  2. Step 2: Convert to fraction form
    42,653.88/63,989.64 = 14,571.72/x
  3. Step 3: Cross multiply
    42,653.88x = 63,989.64 × 14,571.72
  4. Step 4: Simplify right side
    42,653.88x = 932,439,116.98
  5. Step 5: Solve for x
    x = 932,439,116.98/42,653.88
  6. Step 6: Final answer
    x = 21,860.59

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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.