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Finding the Fourth Proportional to 1,486.91, 2,051.85 and 823.74

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Solution

The fourth proportional to 1,486.91, 2,051.85 and 823.74 is: 1,136.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.91 : 2,051.85 = 823.74 : x
  2. Step 2: Convert to fraction form
    1,486.91/2,051.85 = 823.74/x
  3. Step 3: Cross multiply
    1,486.91x = 2,051.85 × 823.74
  4. Step 4: Simplify right side
    1,486.91x = 1,690,199.64
  5. Step 5: Solve for x
    x = 1,690,199.64/1,486.91
  6. Step 6: Final answer
    x = 1,136.72

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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.