Home / 28,133.16-42,214.41-20,405.76

Finding the Fourth Proportional to 28,133.16, 42,214.41 and 20,405.76

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Solution

The fourth proportional to 28,133.16, 42,214.41 and 20,405.76 is: 30,619.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,133.16 : 42,214.41 = 20,405.76 : x
  2. Step 2: Convert to fraction form
    28,133.16/42,214.41 = 20,405.76/x
  3. Step 3: Cross multiply
    28,133.16x = 42,214.41 × 20,405.76
  4. Step 4: Simplify right side
    28,133.16x = 861,417,119.00
  5. Step 5: Solve for x
    x = 861,417,119.00/28,133.16
  6. Step 6: Final answer
    x = 30,619.28

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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.