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Finding the Fourth Proportional to 28,145.70, 38,840.84 and 16,820.10

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Solution

The fourth proportional to 28,145.70, 38,840.84 and 16,820.10 is: 23,211.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,145.70 : 38,840.84 = 16,820.10 : x
  2. Step 2: Convert to fraction form
    28,145.70/38,840.84 = 16,820.10/x
  3. Step 3: Cross multiply
    28,145.70x = 38,840.84 × 16,820.10
  4. Step 4: Simplify right side
    28,145.70x = 653,306,812.88
  5. Step 5: Solve for x
    x = 653,306,812.88/28,145.70
  6. Step 6: Final answer
    x = 23,211.60

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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.