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Finding the Fourth Proportional to 28,237.80, 38,969.22 and 15,490.20

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Solution

The fourth proportional to 28,237.80, 38,969.22 and 15,490.20 is: 21,377.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,237.80 : 38,969.22 = 15,490.20 : x
  2. Step 2: Convert to fraction form
    28,237.80/38,969.22 = 15,490.20/x
  3. Step 3: Cross multiply
    28,237.80x = 38,969.22 × 15,490.20
  4. Step 4: Simplify right side
    28,237.80x = 603,641,011.64
  5. Step 5: Solve for x
    x = 603,641,011.64/28,237.80
  6. Step 6: Final answer
    x = 21,377.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.