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Finding the Fourth Proportional to 12,905.58, 17,808.61 and 7,239.54

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Solution

The fourth proportional to 12,905.58, 17,808.61 and 7,239.54 is: 9,989.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.58 : 17,808.61 = 7,239.54 : x
  2. Step 2: Convert to fraction form
    12,905.58/17,808.61 = 7,239.54/x
  3. Step 3: Cross multiply
    12,905.58x = 17,808.61 × 7,239.54
  4. Step 4: Simplify right side
    12,905.58x = 128,926,144.44
  5. Step 5: Solve for x
    x = 128,926,144.44/12,905.58
  6. Step 6: Final answer
    x = 9,989.95

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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.