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Finding the Fourth Proportional to 142,759.80, 214,139.70 and 128,014.20

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Solution

The fourth proportional to 142,759.80, 214,139.70 and 128,014.20 is: 192,021.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,759.80 : 214,139.70 = 128,014.20 : x
  2. Step 2: Convert to fraction form
    142,759.80/214,139.70 = 128,014.20/x
  3. Step 3: Cross multiply
    142,759.80x = 214,139.70 × 128,014.20
  4. Step 4: Simplify right side
    142,759.80x = 27,412,922,383.74
  5. Step 5: Solve for x
    x = 27,412,922,383.74/142,759.80
  6. Step 6: Final answer
    x = 192,021.30

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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.