Home / 21,000.20-31,500.30-19,185.80

Finding the Fourth Proportional to 21,000.20, 31,500.30 and 19,185.80

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Solution

The fourth proportional to 21,000.20, 31,500.30 and 19,185.80 is: 28,778.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.20 : 31,500.30 = 19,185.80 : x
  2. Step 2: Convert to fraction form
    21,000.20/31,500.30 = 19,185.80/x
  3. Step 3: Cross multiply
    21,000.20x = 31,500.30 × 19,185.80
  4. Step 4: Simplify right side
    21,000.20x = 604,358,455.74
  5. Step 5: Solve for x
    x = 604,358,455.74/21,000.20
  6. Step 6: Final answer
    x = 28,778.70

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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.