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Finding the Fourth Proportional to 14,635.91, 20,197.40 and 7,921.40

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Solution

The fourth proportional to 14,635.91, 20,197.40 and 7,921.40 is: 10,931.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,635.91 : 20,197.40 = 7,921.40 : x
  2. Step 2: Convert to fraction form
    14,635.91/20,197.40 = 7,921.40/x
  3. Step 3: Cross multiply
    14,635.91x = 20,197.40 × 7,921.40
  4. Step 4: Simplify right side
    14,635.91x = 159,991,543.77
  5. Step 5: Solve for x
    x = 159,991,543.77/14,635.91
  6. Step 6: Final answer
    x = 10,931.44

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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.