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Finding the Fourth Proportional to 676.48, 1,008.61 and 669.76

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Solution

The fourth proportional to 676.48, 1,008.61 and 669.76 is: 998.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.48 : 1,008.61 = 669.76 : x
  2. Step 2: Convert to fraction form
    676.48/1,008.61 = 669.76/x
  3. Step 3: Cross multiply
    676.48x = 1,008.61 × 669.76
  4. Step 4: Simplify right side
    676.48x = 675,526.63
  5. Step 5: Solve for x
    x = 675,526.63/676.48
  6. Step 6: Final answer
    x = 998.59

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1.5x scale

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.