Home / 25,520.40-38,280.60-7,990.25

Finding the Fourth Proportional to 25,520.40, 38,280.60 and 7,990.25

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Solution

The fourth proportional to 25,520.40, 38,280.60 and 7,990.25 is: 11,985.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,520.40 : 38,280.60 = 7,990.25 : x
  2. Step 2: Convert to fraction form
    25,520.40/38,280.60 = 7,990.25/x
  3. Step 3: Cross multiply
    25,520.40x = 38,280.60 × 7,990.25
  4. Step 4: Simplify right side
    25,520.40x = 305,871,372.75
  5. Step 5: Solve for x
    x = 305,871,372.75/25,520.40
  6. Step 6: Final answer
    x = 11,985.37

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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.