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Finding the Fourth Proportional to 212,812.80, 319,219.20 and 86,452.80

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Solution

The fourth proportional to 212,812.80, 319,219.20 and 86,452.80 is: 129,679.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,812.80 : 319,219.20 = 86,452.80 : x
  2. Step 2: Convert to fraction form
    212,812.80/319,219.20 = 86,452.80/x
  3. Step 3: Cross multiply
    212,812.80x = 319,219.20 × 86,452.80
  4. Step 4: Simplify right side
    212,812.80x = 27,597,393,653.76
  5. Step 5: Solve for x
    x = 27,597,393,653.76/212,812.80
  6. Step 6: Final answer
    x = 129,679.20

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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.