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Finding the Fourth Proportional to 28,646.64, 42,919.11 and 11,969.91

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Solution

The fourth proportional to 28,646.64, 42,919.11 and 11,969.91 is: 17,933.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,646.64 : 42,919.11 = 11,969.91 : x
  2. Step 2: Convert to fraction form
    28,646.64/42,919.11 = 11,969.91/x
  3. Step 3: Cross multiply
    28,646.64x = 42,919.11 × 11,969.91
  4. Step 4: Simplify right side
    28,646.64x = 513,737,883.98
  5. Step 5: Solve for x
    x = 513,737,883.98/28,646.64
  6. Step 6: Final answer
    x = 17,933.62

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1.5x scale

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.