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Finding the Fourth Proportional to 776.47, 1,071.38 and 461.81

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Solution

The fourth proportional to 776.47, 1,071.38 and 461.81 is: 637.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.47 : 1,071.38 = 461.81 : x
  2. Step 2: Convert to fraction form
    776.47/1,071.38 = 461.81/x
  3. Step 3: Cross multiply
    776.47x = 1,071.38 × 461.81
  4. Step 4: Simplify right side
    776.47x = 494,771.39
  5. Step 5: Solve for x
    x = 494,771.39/776.47
  6. Step 6: Final answer
    x = 637.21

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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.