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Finding the Fourth Proportional to 1,342.86, 1,852.90 and 811.60

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Solution

The fourth proportional to 1,342.86, 1,852.90 and 811.60 is: 1,119.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,342.86 : 1,852.90 = 811.60 : x
  2. Step 2: Convert to fraction form
    1,342.86/1,852.90 = 811.60/x
  3. Step 3: Cross multiply
    1,342.86x = 1,852.90 × 811.60
  4. Step 4: Simplify right side
    1,342.86x = 1,503,813.64
  5. Step 5: Solve for x
    x = 1,503,813.64/1,342.86
  6. Step 6: Final answer
    x = 1,119.86

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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.