Home / 20,130.80-30,184.20-12,345.20

Finding the Fourth Proportional to 20,130.80, 30,184.20 and 12,345.20

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Solution

The fourth proportional to 20,130.80, 30,184.20 and 12,345.20 is: 18,510.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.80 : 30,184.20 = 12,345.20 : x
  2. Step 2: Convert to fraction form
    20,130.80/30,184.20 = 12,345.20/x
  3. Step 3: Cross multiply
    20,130.80x = 30,184.20 × 12,345.20
  4. Step 4: Simplify right side
    20,130.80x = 372,629,985.84
  5. Step 5: Solve for x
    x = 372,629,985.84/20,130.80
  6. Step 6: Final answer
    x = 18,510.44

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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.