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Finding the Fourth Proportional to 1,212.81, 1,672.99 and 715.38

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Solution

The fourth proportional to 1,212.81, 1,672.99 and 715.38 is: 986.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.81 : 1,672.99 = 715.38 : x
  2. Step 2: Convert to fraction form
    1,212.81/1,672.99 = 715.38/x
  3. Step 3: Cross multiply
    1,212.81x = 1,672.99 × 715.38
  4. Step 4: Simplify right side
    1,212.81x = 1,196,823.59
  5. Step 5: Solve for x
    x = 1,196,823.59/1,212.81
  6. Step 6: Final answer
    x = 986.82

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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.