Home / 13,688.31-20,532.47-7,840.83

Finding the Fourth Proportional to 13,688.31, 20,532.47 and 7,840.83

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Solution

The fourth proportional to 13,688.31, 20,532.47 and 7,840.83 is: 11,761.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.31 : 20,532.47 = 7,840.83 : x
  2. Step 2: Convert to fraction form
    13,688.31/20,532.47 = 7,840.83/x
  3. Step 3: Cross multiply
    13,688.31x = 20,532.47 × 7,840.83
  4. Step 4: Simplify right side
    13,688.31x = 160,991,606.75
  5. Step 5: Solve for x
    x = 160,991,606.75/13,688.31
  6. Step 6: Final answer
    x = 11,761.25

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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.