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Finding the Fourth Proportional to 19,312.29, 28,976.94 and 8,220.15

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Solution

The fourth proportional to 19,312.29, 28,976.94 and 8,220.15 is: 12,333.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,312.29 : 28,976.94 = 8,220.15 : x
  2. Step 2: Convert to fraction form
    19,312.29/28,976.94 = 8,220.15/x
  3. Step 3: Cross multiply
    19,312.29x = 28,976.94 × 8,220.15
  4. Step 4: Simplify right side
    19,312.29x = 238,194,793.34
  5. Step 5: Solve for x
    x = 238,194,793.34/19,312.29
  6. Step 6: Final answer
    x = 12,333.85

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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.