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Finding the Fourth Proportional to 14,978.12, 20,671.74 and 12,455.91

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Solution

The fourth proportional to 14,978.12, 20,671.74 and 12,455.91 is: 17,190.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,978.12 : 20,671.74 = 12,455.91 : x
  2. Step 2: Convert to fraction form
    14,978.12/20,671.74 = 12,455.91/x
  3. Step 3: Cross multiply
    14,978.12x = 20,671.74 × 12,455.91
  4. Step 4: Simplify right side
    14,978.12x = 257,485,332.98
  5. Step 5: Solve for x
    x = 257,485,332.98/14,978.12
  6. Step 6: Final answer
    x = 17,190.77

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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.