Home / 1,392,816.80-1,921,379.78-909,664.76

Finding the Fourth Proportional to 1,392,816.80, 1,921,379.78 and 909,664.76

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Solution

The fourth proportional to 1,392,816.80, 1,921,379.78 and 909,664.76 is: 1,254,875.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,816.80 : 1,921,379.78 = 909,664.76 : x
  2. Step 2: Convert to fraction form
    1,392,816.80/1,921,379.78 = 909,664.76/x
  3. Step 3: Cross multiply
    1,392,816.80x = 1,921,379.78 × 909,664.76
  4. Step 4: Simplify right side
    1,392,816.80x = 1,747,811,466,835.65
  5. Step 5: Solve for x
    x = 1,747,811,466,835.65/1,392,816.80
  6. Step 6: Final answer
    x = 1,254,875.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.