Home / 320,821.12-442,670.40-201,520

Finding the Fourth Proportional to 320,821.12, 442,670.40 and 201,520

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Solution

The fourth proportional to 320,821.12, 442,670.40 and 201,520 is: 278,058.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,821.12 : 442,670.40 = 201,520 : x
  2. Step 2: Convert to fraction form
    320,821.12/442,670.40 = 201,520/x
  3. Step 3: Cross multiply
    320,821.12x = 442,670.40 × 201,520
  4. Step 4: Simplify right side
    320,821.12x = 89,206,939,008
  5. Step 5: Solve for x
    x = 89,206,939,008/320,821.12
  6. Step 6: Final answer
    x = 278,058.19

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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.