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Finding the Fourth Proportional to 12,840.70, 19,261.05 and 7,311.10

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Solution

The fourth proportional to 12,840.70, 19,261.05 and 7,311.10 is: 10,966.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840.70 : 19,261.05 = 7,311.10 : x
  2. Step 2: Convert to fraction form
    12,840.70/19,261.05 = 7,311.10/x
  3. Step 3: Cross multiply
    12,840.70x = 19,261.05 × 7,311.10
  4. Step 4: Simplify right side
    12,840.70x = 140,819,462.66
  5. Step 5: Solve for x
    x = 140,819,462.66/12,840.70
  6. Step 6: Final answer
    x = 10,966.65

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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.