Home / 1,320,356.40-1,980,680.40-421,645.20

Finding the Fourth Proportional to 1,320,356.40, 1,980,680.40 and 421,645.20

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Solution

The fourth proportional to 1,320,356.40, 1,980,680.40 and 421,645.20 is: 632,514.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320,356.40 : 1,980,680.40 = 421,645.20 : x
  2. Step 2: Convert to fraction form
    1,320,356.40/1,980,680.40 = 421,645.20/x
  3. Step 3: Cross multiply
    1,320,356.40x = 1,980,680.40 × 421,645.20
  4. Step 4: Simplify right side
    1,320,356.40x = 835,144,383,394.08
  5. Step 5: Solve for x
    x = 835,144,383,394.08/1,320,356.40
  6. Step 6: Final answer
    x = 632,514.36

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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.