Home / 30,529.81-42,136.12-20,961.75

Finding the Fourth Proportional to 30,529.81, 42,136.12 and 20,961.75

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Solution

The fourth proportional to 30,529.81, 42,136.12 and 20,961.75 is: 28,930.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,529.81 : 42,136.12 = 20,961.75 : x
  2. Step 2: Convert to fraction form
    30,529.81/42,136.12 = 20,961.75/x
  3. Step 3: Cross multiply
    30,529.81x = 42,136.12 × 20,961.75
  4. Step 4: Simplify right side
    30,529.81x = 883,246,708.60
  5. Step 5: Solve for x
    x = 883,246,708.60/30,529.81
  6. Step 6: Final answer
    x = 28,930.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.