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Finding the Fourth Proportional to 777.88, 1,074.90 and 580.96

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Solution

The fourth proportional to 777.88, 1,074.90 and 580.96 is: 802.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.88 : 1,074.90 = 580.96 : x
  2. Step 2: Convert to fraction form
    777.88/1,074.90 = 580.96/x
  3. Step 3: Cross multiply
    777.88x = 1,074.90 × 580.96
  4. Step 4: Simplify right side
    777.88x = 624,473.90
  5. Step 5: Solve for x
    x = 624,473.90/777.88
  6. Step 6: Final answer
    x = 802.79

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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.