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Finding the Fourth Proportional to 777.47, 1,072.91 and 445.91

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Solution

The fourth proportional to 777.47, 1,072.91 and 445.91 is: 615.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.47 : 1,072.91 = 445.91 : x
  2. Step 2: Convert to fraction form
    777.47/1,072.91 = 445.91/x
  3. Step 3: Cross multiply
    777.47x = 1,072.91 × 445.91
  4. Step 4: Simplify right side
    777.47x = 478,417.05
  5. Step 5: Solve for x
    x = 478,417.05/777.47
  6. Step 6: Final answer
    x = 615.36

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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.