Home / 12,102.40-18,139.20-9,020.80

Finding the Fourth Proportional to 12,102.40, 18,139.20 and 9,020.80

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Solution

The fourth proportional to 12,102.40, 18,139.20 and 9,020.80 is: 13,520.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,102.40 : 18,139.20 = 9,020.80 : x
  2. Step 2: Convert to fraction form
    12,102.40/18,139.20 = 9,020.80/x
  3. Step 3: Cross multiply
    12,102.40x = 18,139.20 × 9,020.80
  4. Step 4: Simplify right side
    12,102.40x = 163,630,095.36
  5. Step 5: Solve for x
    x = 163,630,095.36/12,102.40
  6. Step 6: Final answer
    x = 13,520.47

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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.