Home / 1,392,129.20-2,086,811.40-642,868.40

Finding the Fourth Proportional to 1,392,129.20, 2,086,811.40 and 642,868.40

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Solution

The fourth proportional to 1,392,129.20, 2,086,811.40 and 642,868.40 is: 963,664.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,129.20 : 2,086,811.40 = 642,868.40 : x
  2. Step 2: Convert to fraction form
    1,392,129.20/2,086,811.40 = 642,868.40/x
  3. Step 3: Cross multiply
    1,392,129.20x = 2,086,811.40 × 642,868.40
  4. Step 4: Simplify right side
    1,392,129.20x = 1,341,545,105,819.76
  5. Step 5: Solve for x
    x = 1,341,545,105,819.76/1,392,129.20
  6. Step 6: Final answer
    x = 963,664.22

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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.