Home / 20,124.80-30,187.20-13,126.40

Finding the Fourth Proportional to 20,124.80, 30,187.20 and 13,126.40

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Solution

The fourth proportional to 20,124.80, 30,187.20 and 13,126.40 is: 19,689.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,124.80 : 30,187.20 = 13,126.40 : x
  2. Step 2: Convert to fraction form
    20,124.80/30,187.20 = 13,126.40/x
  3. Step 3: Cross multiply
    20,124.80x = 30,187.20 × 13,126.40
  4. Step 4: Simplify right side
    20,124.80x = 396,249,262.08
  5. Step 5: Solve for x
    x = 396,249,262.08/20,124.80
  6. Step 6: Final answer
    x = 19,689.60

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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.