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Finding the Fourth Proportional to 1,313.45, 1,813.41 and 816.77

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Solution

The fourth proportional to 1,313.45, 1,813.41 and 816.77 is: 1,127.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.45 : 1,813.41 = 816.77 : x
  2. Step 2: Convert to fraction form
    1,313.45/1,813.41 = 816.77/x
  3. Step 3: Cross multiply
    1,313.45x = 1,813.41 × 816.77
  4. Step 4: Simplify right side
    1,313.45x = 1,481,133.33
  5. Step 5: Solve for x
    x = 1,481,133.33/1,313.45
  6. Step 6: Final answer
    x = 1,127.66

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Half scale
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Double scale
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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.