Home / 20,985.40-31,405.20-19,235.80

Finding the Fourth Proportional to 20,985.40, 31,405.20 and 19,235.80

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Solution

The fourth proportional to 20,985.40, 31,405.20 and 19,235.80 is: 28,786.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.40 : 31,405.20 = 19,235.80 : x
  2. Step 2: Convert to fraction form
    20,985.40/31,405.20 = 19,235.80/x
  3. Step 3: Cross multiply
    20,985.40x = 31,405.20 × 19,235.80
  4. Step 4: Simplify right side
    20,985.40x = 604,104,146.16
  5. Step 5: Solve for x
    x = 604,104,146.16/20,985.40
  6. Step 6: Final answer
    x = 28,786.88

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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.