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Finding the Fourth Proportional to 28,012.80, 42,019.20 and 19,702.20

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Solution

The fourth proportional to 28,012.80, 42,019.20 and 19,702.20 is: 29,553.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,012.80 : 42,019.20 = 19,702.20 : x
  2. Step 2: Convert to fraction form
    28,012.80/42,019.20 = 19,702.20/x
  3. Step 3: Cross multiply
    28,012.80x = 42,019.20 × 19,702.20
  4. Step 4: Simplify right side
    28,012.80x = 827,870,682.24
  5. Step 5: Solve for x
    x = 827,870,682.24/28,012.80
  6. Step 6: Final answer
    x = 29,553.30

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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.