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Finding the Fourth Proportional to 671.19, 999.64 and 661.08

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Solution

The fourth proportional to 671.19, 999.64 and 661.08 is: 984.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.19 : 999.64 = 661.08 : x
  2. Step 2: Convert to fraction form
    671.19/999.64 = 661.08/x
  3. Step 3: Cross multiply
    671.19x = 999.64 × 661.08
  4. Step 4: Simplify right side
    671.19x = 660,842.01
  5. Step 5: Solve for x
    x = 660,842.01/671.19
  6. Step 6: Final answer
    x = 984.58

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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.