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Finding the Fourth Proportional to 777.62, 1,072.80 and 445.87

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Solution

The fourth proportional to 777.62, 1,072.80 and 445.87 is: 615.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.62 : 1,072.80 = 445.87 : x
  2. Step 2: Convert to fraction form
    777.62/1,072.80 = 445.87/x
  3. Step 3: Cross multiply
    777.62x = 1,072.80 × 445.87
  4. Step 4: Simplify right side
    777.62x = 478,329.34
  5. Step 5: Solve for x
    x = 478,329.34/777.62
  6. Step 6: Final answer
    x = 615.12

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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.