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Finding the Fourth Proportional to 996.86, 1,374.74 and 623.72

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Solution

The fourth proportional to 996.86, 1,374.74 and 623.72 is: 860.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.86 : 1,374.74 = 623.72 : x
  2. Step 2: Convert to fraction form
    996.86/1,374.74 = 623.72/x
  3. Step 3: Cross multiply
    996.86x = 1,374.74 × 623.72
  4. Step 4: Simplify right side
    996.86x = 857,452.83
  5. Step 5: Solve for x
    x = 857,452.83/996.86
  6. Step 6: Final answer
    x = 860.15

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.