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Finding the Fourth Proportional to 916.85, 1,374.06 and 672.23

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Solution

The fourth proportional to 916.85, 1,374.06 and 672.23 is: 1,007.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.85 : 1,374.06 = 672.23 : x
  2. Step 2: Convert to fraction form
    916.85/1,374.06 = 672.23/x
  3. Step 3: Cross multiply
    916.85x = 1,374.06 × 672.23
  4. Step 4: Simplify right side
    916.85x = 923,690.31
  5. Step 5: Solve for x
    x = 923,690.31/916.85
  6. Step 6: Final answer
    x = 1,007.46

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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.