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Finding the Fourth Proportional to 12,678.44, 18,988.64 and 7,737.20

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Solution

The fourth proportional to 12,678.44, 18,988.64 and 7,737.20 is: 11,588.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,678.44 : 18,988.64 = 7,737.20 : x
  2. Step 2: Convert to fraction form
    12,678.44/18,988.64 = 7,737.20/x
  3. Step 3: Cross multiply
    12,678.44x = 18,988.64 × 7,737.20
  4. Step 4: Simplify right side
    12,678.44x = 146,918,905.41
  5. Step 5: Solve for x
    x = 146,918,905.41/12,678.44
  6. Step 6: Final answer
    x = 11,588.09

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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.