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Finding the Fourth Proportional to 28,013.80, 42,020.70 and 19,703.20

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Solution

The fourth proportional to 28,013.80, 42,020.70 and 19,703.20 is: 29,554.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,013.80 : 42,020.70 = 19,703.20 : x
  2. Step 2: Convert to fraction form
    28,013.80/42,020.70 = 19,703.20/x
  3. Step 3: Cross multiply
    28,013.80x = 42,020.70 × 19,703.20
  4. Step 4: Simplify right side
    28,013.80x = 827,942,256.24
  5. Step 5: Solve for x
    x = 827,942,256.24/28,013.80
  6. Step 6: Final answer
    x = 29,554.80

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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.