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Finding the Fourth Proportional to 1,342.70, 1,852.36 and 811.44

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Solution

The fourth proportional to 1,342.70, 1,852.36 and 811.44 is: 1,119.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,342.70 : 1,852.36 = 811.44 : x
  2. Step 2: Convert to fraction form
    1,342.70/1,852.36 = 811.44/x
  3. Step 3: Cross multiply
    1,342.70x = 1,852.36 × 811.44
  4. Step 4: Simplify right side
    1,342.70x = 1,503,079.00
  5. Step 5: Solve for x
    x = 1,503,079.00/1,342.70
  6. Step 6: Final answer
    x = 1,119.45

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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.