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Finding the Fourth Proportional to 1,412.22, 1,948.86 and 823.15

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Solution

The fourth proportional to 1,412.22, 1,948.86 and 823.15 is: 1,135.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.22 : 1,948.86 = 823.15 : x
  2. Step 2: Convert to fraction form
    1,412.22/1,948.86 = 823.15/x
  3. Step 3: Cross multiply
    1,412.22x = 1,948.86 × 823.15
  4. Step 4: Simplify right side
    1,412.22x = 1,604,204.11
  5. Step 5: Solve for x
    x = 1,604,204.11/1,412.22
  6. Step 6: Final answer
    x = 1,135.94

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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.