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Finding the Fourth Proportional to 777.94, 1,072.15 and 630.93

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Solution

The fourth proportional to 777.94, 1,072.15 and 630.93 is: 869.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.94 : 1,072.15 = 630.93 : x
  2. Step 2: Convert to fraction form
    777.94/1,072.15 = 630.93/x
  3. Step 3: Cross multiply
    777.94x = 1,072.15 × 630.93
  4. Step 4: Simplify right side
    777.94x = 676,451.60
  5. Step 5: Solve for x
    x = 676,451.60/777.94
  6. Step 6: Final answer
    x = 869.54

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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.