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Finding the Fourth Proportional to 1,072.70, 1,480.22 and 630.50

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Solution

The fourth proportional to 1,072.70, 1,480.22 and 630.50 is: 870.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.70 : 1,480.22 = 630.50 : x
  2. Step 2: Convert to fraction form
    1,072.70/1,480.22 = 630.50/x
  3. Step 3: Cross multiply
    1,072.70x = 1,480.22 × 630.50
  4. Step 4: Simplify right side
    1,072.70x = 933,278.71
  5. Step 5: Solve for x
    x = 933,278.71/1,072.70
  6. Step 6: Final answer
    x = 870.03

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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.