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Finding the Fourth Proportional to 128,809.70, 192,955.35 and 86,819.30

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Solution

The fourth proportional to 128,809.70, 192,955.35 and 86,819.30 is: 130,054.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,809.70 : 192,955.35 = 86,819.30 : x
  2. Step 2: Convert to fraction form
    128,809.70/192,955.35 = 86,819.30/x
  3. Step 3: Cross multiply
    128,809.70x = 192,955.35 × 86,819.30
  4. Step 4: Simplify right side
    128,809.70x = 16,752,248,418.26
  5. Step 5: Solve for x
    x = 16,752,248,418.26/128,809.70
  6. Step 6: Final answer
    x = 130,054.25

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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.