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Finding the Fourth Proportional to 1,657.84, 2,486.75 and 425.21

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Solution

The fourth proportional to 1,657.84, 2,486.75 and 425.21 is: 637.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,657.84 : 2,486.75 = 425.21 : x
  2. Step 2: Convert to fraction form
    1,657.84/2,486.75 = 425.21/x
  3. Step 3: Cross multiply
    1,657.84x = 2,486.75 × 425.21
  4. Step 4: Simplify right side
    1,657.84x = 1,057,390.97
  5. Step 5: Solve for x
    x = 1,057,390.97/1,657.84
  6. Step 6: Final answer
    x = 637.81

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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.