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Finding the Fourth Proportional to 1,683.18, 2,525.31 and 643.34

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Solution

The fourth proportional to 1,683.18, 2,525.31 and 643.34 is: 965.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,683.18 : 2,525.31 = 643.34 : x
  2. Step 2: Convert to fraction form
    1,683.18/2,525.31 = 643.34/x
  3. Step 3: Cross multiply
    1,683.18x = 2,525.31 × 643.34
  4. Step 4: Simplify right side
    1,683.18x = 1,624,639.25
  5. Step 5: Solve for x
    x = 1,624,639.25/1,683.18
  6. Step 6: Final answer
    x = 965.22

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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.