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Finding the Fourth Proportional to 689.23, 1,030.20 and 672.82

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Solution

The fourth proportional to 689.23, 1,030.20 and 672.82 is: 1,005.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.23 : 1,030.20 = 672.82 : x
  2. Step 2: Convert to fraction form
    689.23/1,030.20 = 672.82/x
  3. Step 3: Cross multiply
    689.23x = 1,030.20 × 672.82
  4. Step 4: Simplify right side
    689.23x = 693,139.16
  5. Step 5: Solve for x
    x = 693,139.16/689.23
  6. Step 6: Final answer
    x = 1,005.67

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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.