Home / 20,972.79-31,459.14-5,390.46

Finding the Fourth Proportional to 20,972.79, 31,459.14 and 5,390.46

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Solution

The fourth proportional to 20,972.79, 31,459.14 and 5,390.46 is: 8,085.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.79 : 31,459.14 = 5,390.46 : x
  2. Step 2: Convert to fraction form
    20,972.79/31,459.14 = 5,390.46/x
  3. Step 3: Cross multiply
    20,972.79x = 31,459.14 × 5,390.46
  4. Step 4: Simplify right side
    20,972.79x = 169,579,235.80
  5. Step 5: Solve for x
    x = 169,579,235.80/20,972.79
  6. Step 6: Final answer
    x = 8,085.68

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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.