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Finding the Fourth Proportional to 52,102.88, 78,153.20 and 12,660.20

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Solution

The fourth proportional to 52,102.88, 78,153.20 and 12,660.20 is: 18,990.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,102.88 : 78,153.20 = 12,660.20 : x
  2. Step 2: Convert to fraction form
    52,102.88/78,153.20 = 12,660.20/x
  3. Step 3: Cross multiply
    52,102.88x = 78,153.20 × 12,660.20
  4. Step 4: Simplify right side
    52,102.88x = 989,435,142.64
  5. Step 5: Solve for x
    x = 989,435,142.64/52,102.88
  6. Step 6: Final answer
    x = 18,990.03

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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.