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Finding the Fourth Proportional to 142,112.60, 212,759.30 and 86,816.60

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Solution

The fourth proportional to 142,112.60, 212,759.30 and 86,816.60 is: 129,974.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,112.60 : 212,759.30 = 86,816.60 : x
  2. Step 2: Convert to fraction form
    142,112.60/212,759.30 = 86,816.60/x
  3. Step 3: Cross multiply
    142,112.60x = 212,759.30 × 86,816.60
  4. Step 4: Simplify right side
    142,112.60x = 18,471,039,044.38
  5. Step 5: Solve for x
    x = 18,471,039,044.38/142,112.60
  6. Step 6: Final answer
    x = 129,974.68

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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.