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Finding the Fourth Proportional to 1,721.58, 2,582.28 and 423

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Solution

The fourth proportional to 1,721.58, 2,582.28 and 423 is: 634.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.58 : 2,582.28 = 423 : x
  2. Step 2: Convert to fraction form
    1,721.58/2,582.28 = 423/x
  3. Step 3: Cross multiply
    1,721.58x = 2,582.28 × 423
  4. Step 4: Simplify right side
    1,721.58x = 1,092,304.44
  5. Step 5: Solve for x
    x = 1,092,304.44/1,721.58
  6. Step 6: Final answer
    x = 634.48

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1.5x scale

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.