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Finding the Fourth Proportional to 20,538.40, 30,807.60 and 7,405.60

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Solution

The fourth proportional to 20,538.40, 30,807.60 and 7,405.60 is: 11,108.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,538.40 : 30,807.60 = 7,405.60 : x
  2. Step 2: Convert to fraction form
    20,538.40/30,807.60 = 7,405.60/x
  3. Step 3: Cross multiply
    20,538.40x = 30,807.60 × 7,405.60
  4. Step 4: Simplify right side
    20,538.40x = 228,148,762.56
  5. Step 5: Solve for x
    x = 228,148,762.56/20,538.40
  6. Step 6: Final answer
    x = 11,108.40

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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.