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Finding the Fourth Proportional to 12,353.10, 18,529.65 and 7,420.20

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Solution

The fourth proportional to 12,353.10, 18,529.65 and 7,420.20 is: 11,130.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,353.10 : 18,529.65 = 7,420.20 : x
  2. Step 2: Convert to fraction form
    12,353.10/18,529.65 = 7,420.20/x
  3. Step 3: Cross multiply
    12,353.10x = 18,529.65 × 7,420.20
  4. Step 4: Simplify right side
    12,353.10x = 137,493,708.93
  5. Step 5: Solve for x
    x = 137,493,708.93/12,353.10
  6. Step 6: Final answer
    x = 11,130.30

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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.