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Finding the Fourth Proportional to 673.12, 1,009.77 and 661.06

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Solution

The fourth proportional to 673.12, 1,009.77 and 661.06 is: 991.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.12 : 1,009.77 = 661.06 : x
  2. Step 2: Convert to fraction form
    673.12/1,009.77 = 661.06/x
  3. Step 3: Cross multiply
    673.12x = 1,009.77 × 661.06
  4. Step 4: Simplify right side
    673.12x = 667,518.56
  5. Step 5: Solve for x
    x = 667,518.56/673.12
  6. Step 6: Final answer
    x = 991.68

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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.