Home / 20,123.40-30,185.10-17,207.40

Finding the Fourth Proportional to 20,123.40, 30,185.10 and 17,207.40

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Solution

The fourth proportional to 20,123.40, 30,185.10 and 17,207.40 is: 25,811.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,123.40 : 30,185.10 = 17,207.40 : x
  2. Step 2: Convert to fraction form
    20,123.40/30,185.10 = 17,207.40/x
  3. Step 3: Cross multiply
    20,123.40x = 30,185.10 × 17,207.40
  4. Step 4: Simplify right side
    20,123.40x = 519,407,089.74
  5. Step 5: Solve for x
    x = 519,407,089.74/20,123.40
  6. Step 6: Final answer
    x = 25,811.10

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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.