Home / 1,320,490.92-1,979,992.75-421,721.40

Finding the Fourth Proportional to 1,320,490.92, 1,979,992.75 and 421,721.40

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Solution

The fourth proportional to 1,320,490.92, 1,979,992.75 and 421,721.40 is: 632,344.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320,490.92 : 1,979,992.75 = 421,721.40 : x
  2. Step 2: Convert to fraction form
    1,320,490.92/1,979,992.75 = 421,721.40/x
  3. Step 3: Cross multiply
    1,320,490.92x = 1,979,992.75 × 421,721.40
  4. Step 4: Simplify right side
    1,320,490.92x = 835,005,314,519.85
  5. Step 5: Solve for x
    x = 835,005,314,519.85/1,320,490.92
  6. Step 6: Final answer
    x = 632,344.61

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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.