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Finding the Fourth Proportional to 1,064.84, 1,469.36 and 645.26

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Solution

The fourth proportional to 1,064.84, 1,469.36 and 645.26 is: 890.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,064.84 : 1,469.36 = 645.26 : x
  2. Step 2: Convert to fraction form
    1,064.84/1,469.36 = 645.26/x
  3. Step 3: Cross multiply
    1,064.84x = 1,469.36 × 645.26
  4. Step 4: Simplify right side
    1,064.84x = 948,113.50
  5. Step 5: Solve for x
    x = 948,113.50/1,064.84
  6. Step 6: Final answer
    x = 890.39

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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.