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Finding the Fourth Proportional to 769.77, 1,062.25 and 420.45

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Solution

The fourth proportional to 769.77, 1,062.25 and 420.45 is: 580.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.77 : 1,062.25 = 420.45 : x
  2. Step 2: Convert to fraction form
    769.77/1,062.25 = 420.45/x
  3. Step 3: Cross multiply
    769.77x = 1,062.25 × 420.45
  4. Step 4: Simplify right side
    769.77x = 446,623.01
  5. Step 5: Solve for x
    x = 446,623.01/769.77
  6. Step 6: Final answer
    x = 580.20

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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.