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Finding the Fourth Proportional to 1,212.87, 1,673.74 and 715.53

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Solution

The fourth proportional to 1,212.87, 1,673.74 and 715.53 is: 987.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.87 : 1,673.74 = 715.53 : x
  2. Step 2: Convert to fraction form
    1,212.87/1,673.74 = 715.53/x
  3. Step 3: Cross multiply
    1,212.87x = 1,673.74 × 715.53
  4. Step 4: Simplify right side
    1,212.87x = 1,197,611.18
  5. Step 5: Solve for x
    x = 1,197,611.18/1,212.87
  6. Step 6: Final answer
    x = 987.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.