Home / 1,727.32-2,590.98-428.79

Finding the Fourth Proportional to 1,727.32, 2,590.98 and 428.79

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Solution

The fourth proportional to 1,727.32, 2,590.98 and 428.79 is: 643.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,727.32 : 2,590.98 = 428.79 : x
  2. Step 2: Convert to fraction form
    1,727.32/2,590.98 = 428.79/x
  3. Step 3: Cross multiply
    1,727.32x = 2,590.98 × 428.79
  4. Step 4: Simplify right side
    1,727.32x = 1,110,987.92
  5. Step 5: Solve for x
    x = 1,110,987.92/1,727.32
  6. Step 6: Final answer
    x = 643.19

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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.