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Finding the Fourth Proportional to 1,072.81, 1,480.36 and 630.85

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Solution

The fourth proportional to 1,072.81, 1,480.36 and 630.85 is: 870.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.81 : 1,480.36 = 630.85 : x
  2. Step 2: Convert to fraction form
    1,072.81/1,480.36 = 630.85/x
  3. Step 3: Cross multiply
    1,072.81x = 1,480.36 × 630.85
  4. Step 4: Simplify right side
    1,072.81x = 933,885.11
  5. Step 5: Solve for x
    x = 933,885.11/1,072.81
  6. Step 6: Final answer
    x = 870.50

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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.