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Finding the Fourth Proportional to 14,695.40, 20,279.80 and 7,981.09

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Solution

The fourth proportional to 14,695.40, 20,279.80 and 7,981.09 is: 11,013.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,695.40 : 20,279.80 = 7,981.09 : x
  2. Step 2: Convert to fraction form
    14,695.40/20,279.80 = 7,981.09/x
  3. Step 3: Cross multiply
    14,695.40x = 20,279.80 × 7,981.09
  4. Step 4: Simplify right side
    14,695.40x = 161,854,908.98
  5. Step 5: Solve for x
    x = 161,854,908.98/14,695.40
  6. Step 6: Final answer
    x = 11,013.98

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1.5x scale

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.