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Finding the Fourth Proportional to 1,881.02, 2,821.79 and 785.13

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Solution

The fourth proportional to 1,881.02, 2,821.79 and 785.13 is: 1,177.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,881.02 : 2,821.79 = 785.13 : x
  2. Step 2: Convert to fraction form
    1,881.02/2,821.79 = 785.13/x
  3. Step 3: Cross multiply
    1,881.02x = 2,821.79 × 785.13
  4. Step 4: Simplify right side
    1,881.02x = 2,215,463.36
  5. Step 5: Solve for x
    x = 2,215,463.36/1,881.02
  6. Step 6: Final answer
    x = 1,177.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.