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Finding the Fourth Proportional to 676.19, 1,008.76 and 645.23

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Solution

The fourth proportional to 676.19, 1,008.76 and 645.23 is: 962.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.19 : 1,008.76 = 645.23 : x
  2. Step 2: Convert to fraction form
    676.19/1,008.76 = 645.23/x
  3. Step 3: Cross multiply
    676.19x = 1,008.76 × 645.23
  4. Step 4: Simplify right side
    676.19x = 650,878.99
  5. Step 5: Solve for x
    x = 650,878.99/676.19
  6. Step 6: Final answer
    x = 962.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.