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Finding the Fourth Proportional to 1,145.41, 1,715.93 and 681.79

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Solution

The fourth proportional to 1,145.41, 1,715.93 and 681.79 is: 1,021.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.41 : 1,715.93 = 681.79 : x
  2. Step 2: Convert to fraction form
    1,145.41/1,715.93 = 681.79/x
  3. Step 3: Cross multiply
    1,145.41x = 1,715.93 × 681.79
  4. Step 4: Simplify right side
    1,145.41x = 1,169,905.83
  5. Step 5: Solve for x
    x = 1,169,905.83/1,145.41
  6. Step 6: Final answer
    x = 1,021.38

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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.