Home / 20,819.79-31,241.90-7,681.32

Finding the Fourth Proportional to 20,819.79, 31,241.90 and 7,681.32

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Solution

The fourth proportional to 20,819.79, 31,241.90 and 7,681.32 is: 11,526.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.79 : 31,241.90 = 7,681.32 : x
  2. Step 2: Convert to fraction form
    20,819.79/31,241.90 = 7,681.32/x
  3. Step 3: Cross multiply
    20,819.79x = 31,241.90 × 7,681.32
  4. Step 4: Simplify right side
    20,819.79x = 239,979,031.31
  5. Step 5: Solve for x
    x = 239,979,031.31/20,819.79
  6. Step 6: Final answer
    x = 11,526.49

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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.