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Finding the Fourth Proportional to 1,124.18, 1,683.53 and 685.64

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Solution

The fourth proportional to 1,124.18, 1,683.53 and 685.64 is: 1,026.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.18 : 1,683.53 = 685.64 : x
  2. Step 2: Convert to fraction form
    1,124.18/1,683.53 = 685.64/x
  3. Step 3: Cross multiply
    1,124.18x = 1,683.53 × 685.64
  4. Step 4: Simplify right side
    1,124.18x = 1,154,297.98
  5. Step 5: Solve for x
    x = 1,154,297.98/1,124.18
  6. Step 6: Final answer
    x = 1,026.79

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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.