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Finding the Fourth Proportional to 777.13, 1,072.44 and 423.05

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Solution

The fourth proportional to 777.13, 1,072.44 and 423.05 is: 583.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.13 : 1,072.44 = 423.05 : x
  2. Step 2: Convert to fraction form
    777.13/1,072.44 = 423.05/x
  3. Step 3: Cross multiply
    777.13x = 1,072.44 × 423.05
  4. Step 4: Simplify right side
    777.13x = 453,693.63
  5. Step 5: Solve for x
    x = 453,693.63/777.13
  6. Step 6: Final answer
    x = 583.81

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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.