Home / 42,928.20-64,405.80-20,742.30

Finding the Fourth Proportional to 42,928.20, 64,405.80 and 20,742.30

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Solution

The fourth proportional to 42,928.20, 64,405.80 and 20,742.30 is: 31,119.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,928.20 : 64,405.80 = 20,742.30 : x
  2. Step 2: Convert to fraction form
    42,928.20/64,405.80 = 20,742.30/x
  3. Step 3: Cross multiply
    42,928.20x = 64,405.80 × 20,742.30
  4. Step 4: Simplify right side
    42,928.20x = 1,335,924,425.34
  5. Step 5: Solve for x
    x = 1,335,924,425.34/42,928.20
  6. Step 6: Final answer
    x = 31,119.97

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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.