Home / 20,215.40-30,290.70-13,281.80

Finding the Fourth Proportional to 20,215.40, 30,290.70 and 13,281.80

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Solution

The fourth proportional to 20,215.40, 30,290.70 and 13,281.80 is: 19,901.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,215.40 : 30,290.70 = 13,281.80 : x
  2. Step 2: Convert to fraction form
    20,215.40/30,290.70 = 13,281.80/x
  3. Step 3: Cross multiply
    20,215.40x = 30,290.70 × 13,281.80
  4. Step 4: Simplify right side
    20,215.40x = 402,315,019.26
  5. Step 5: Solve for x
    x = 402,315,019.26/20,215.40
  6. Step 6: Final answer
    x = 19,901.41

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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.