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Finding the Fourth Proportional to 12,989.77, 19,484.65 and 7,439.27

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Solution

The fourth proportional to 12,989.77, 19,484.65 and 7,439.27 is: 11,158.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989.77 : 19,484.65 = 7,439.27 : x
  2. Step 2: Convert to fraction form
    12,989.77/19,484.65 = 7,439.27/x
  3. Step 3: Cross multiply
    12,989.77x = 19,484.65 × 7,439.27
  4. Step 4: Simplify right side
    12,989.77x = 144,951,538.88
  5. Step 5: Solve for x
    x = 144,951,538.88/12,989.77
  6. Step 6: Final answer
    x = 11,158.90

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Double scale
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Similar ratio
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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.