Home / 20,699.28-31,078.08-19,759.68

Finding the Fourth Proportional to 20,699.28, 31,078.08 and 19,759.68

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Solution

The fourth proportional to 20,699.28, 31,078.08 and 19,759.68 is: 29,667.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.28 : 31,078.08 = 19,759.68 : x
  2. Step 2: Convert to fraction form
    20,699.28/31,078.08 = 19,759.68/x
  3. Step 3: Cross multiply
    20,699.28x = 31,078.08 × 19,759.68
  4. Step 4: Simplify right side
    20,699.28x = 614,092,915.81
  5. Step 5: Solve for x
    x = 614,092,915.81/20,699.28
  6. Step 6: Final answer
    x = 29,667.36

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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.