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Finding the Fourth Proportional to 777.39, 1,072.65 and 445.83

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Solution

The fourth proportional to 777.39, 1,072.65 and 445.83 is: 615.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.39 : 1,072.65 = 445.83 : x
  2. Step 2: Convert to fraction form
    777.39/1,072.65 = 445.83/x
  3. Step 3: Cross multiply
    777.39x = 1,072.65 × 445.83
  4. Step 4: Simplify right side
    777.39x = 478,219.55
  5. Step 5: Solve for x
    x = 478,219.55/777.39
  6. Step 6: Final answer
    x = 615.16

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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.