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Finding the Fourth Proportional to 891.90, 1,231.47 and 630.27

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Solution

The fourth proportional to 891.90, 1,231.47 and 630.27 is: 870.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.90 : 1,231.47 = 630.27 : x
  2. Step 2: Convert to fraction form
    891.90/1,231.47 = 630.27/x
  3. Step 3: Cross multiply
    891.90x = 1,231.47 × 630.27
  4. Step 4: Simplify right side
    891.90x = 776,158.60
  5. Step 5: Solve for x
    x = 776,158.60/891.90
  6. Step 6: Final answer
    x = 870.23

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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.