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Finding the Fourth Proportional to 1,813.78, 2,503.02 and 985.78

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Solution

The fourth proportional to 1,813.78, 2,503.02 and 985.78 is: 1,360.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.78 : 2,503.02 = 985.78 : x
  2. Step 2: Convert to fraction form
    1,813.78/2,503.02 = 985.78/x
  3. Step 3: Cross multiply
    1,813.78x = 2,503.02 × 985.78
  4. Step 4: Simplify right side
    1,813.78x = 2,467,428.34
  5. Step 5: Solve for x
    x = 2,467,428.34/1,813.78
  6. Step 6: Final answer
    x = 1,360.38

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Half 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.