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Finding the Fourth Proportional to 672.12, 1,000.08 and 661.02

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Solution

The fourth proportional to 672.12, 1,000.08 and 661.02 is: 983.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.12 : 1,000.08 = 661.02 : x
  2. Step 2: Convert to fraction form
    672.12/1,000.08 = 661.02/x
  3. Step 3: Cross multiply
    672.12x = 1,000.08 × 661.02
  4. Step 4: Simplify right side
    672.12x = 661,072.88
  5. Step 5: Solve for x
    x = 661,072.88/672.12
  6. Step 6: Final answer
    x = 983.56

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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.