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Finding the Fourth Proportional to 1,004.33, 1,386.38 and 645.87

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Solution

The fourth proportional to 1,004.33, 1,386.38 and 645.87 is: 891.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.33 : 1,386.38 = 645.87 : x
  2. Step 2: Convert to fraction form
    1,004.33/1,386.38 = 645.87/x
  3. Step 3: Cross multiply
    1,004.33x = 1,386.38 × 645.87
  4. Step 4: Simplify right side
    1,004.33x = 895,428.06
  5. Step 5: Solve for x
    x = 895,428.06/1,004.33
  6. Step 6: Final answer
    x = 891.57

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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.