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Finding the Fourth Proportional to 1,209.96, 1,670.40 and 817.68

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Solution

The fourth proportional to 1,209.96, 1,670.40 and 817.68 is: 1,128.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.96 : 1,670.40 = 817.68 : x
  2. Step 2: Convert to fraction form
    1,209.96/1,670.40 = 817.68/x
  3. Step 3: Cross multiply
    1,209.96x = 1,670.40 × 817.68
  4. Step 4: Simplify right side
    1,209.96x = 1,365,852.67
  5. Step 5: Solve for x
    x = 1,365,852.67/1,209.96
  6. Step 6: Final answer
    x = 1,128.84

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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.