Home / 20,999.04-31,421.88-12,648.48

Finding the Fourth Proportional to 20,999.04, 31,421.88 and 12,648.48

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Solution

The fourth proportional to 20,999.04, 31,421.88 and 12,648.48 is: 18,926.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.04 : 31,421.88 = 12,648.48 : x
  2. Step 2: Convert to fraction form
    20,999.04/31,421.88 = 12,648.48/x
  3. Step 3: Cross multiply
    20,999.04x = 31,421.88 × 12,648.48
  4. Step 4: Simplify right side
    20,999.04x = 397,439,020.74
  5. Step 5: Solve for x
    x = 397,439,020.74/20,999.04
  6. Step 6: Final answer
    x = 18,926.53

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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.