Home / 12,128.40-18,181.80-10,816.20

Finding the Fourth Proportional to 12,128.40, 18,181.80 and 10,816.20

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Solution

The fourth proportional to 12,128.40, 18,181.80 and 10,816.20 is: 16,214.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.40 : 18,181.80 = 10,816.20 : x
  2. Step 2: Convert to fraction form
    12,128.40/18,181.80 = 10,816.20/x
  3. Step 3: Cross multiply
    12,128.40x = 18,181.80 × 10,816.20
  4. Step 4: Simplify right side
    12,128.40x = 196,657,985.16
  5. Step 5: Solve for x
    x = 196,657,985.16/12,128.40
  6. Step 6: Final answer
    x = 16,214.67

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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.