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Finding the Fourth Proportional to 1,314.12, 1,813.83 and 816.48

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Solution

The fourth proportional to 1,314.12, 1,813.83 and 816.48 is: 1,126.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.12 : 1,813.83 = 816.48 : x
  2. Step 2: Convert to fraction form
    1,314.12/1,813.83 = 816.48/x
  3. Step 3: Cross multiply
    1,314.12x = 1,813.83 × 816.48
  4. Step 4: Simplify right side
    1,314.12x = 1,480,955.92
  5. Step 5: Solve for x
    x = 1,480,955.92/1,314.12
  6. Step 6: Final answer
    x = 1,126.96

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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.