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Finding the Fourth Proportional to 84,781.70, 127,172.55 and 25,611.20

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Solution

The fourth proportional to 84,781.70, 127,172.55 and 25,611.20 is: 38,416.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,781.70 : 127,172.55 = 25,611.20 : x
  2. Step 2: Convert to fraction form
    84,781.70/127,172.55 = 25,611.20/x
  3. Step 3: Cross multiply
    84,781.70x = 127,172.55 × 25,611.20
  4. Step 4: Simplify right side
    84,781.70x = 3,257,041,612.56
  5. Step 5: Solve for x
    x = 3,257,041,612.56/84,781.70
  6. Step 6: Final answer
    x = 38,416.80

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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.