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Finding the Fourth Proportional to 28,133.60, 38,821.44 and 15,557.60

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Solution

The fourth proportional to 28,133.60, 38,821.44 and 15,557.60 is: 21,467.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,133.60 : 38,821.44 = 15,557.60 : x
  2. Step 2: Convert to fraction form
    28,133.60/38,821.44 = 15,557.60/x
  3. Step 3: Cross multiply
    28,133.60x = 38,821.44 × 15,557.60
  4. Step 4: Simplify right side
    28,133.60x = 603,968,434.94
  5. Step 5: Solve for x
    x = 603,968,434.94/28,133.60
  6. Step 6: Final answer
    x = 21,467.87

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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.