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Finding the Fourth Proportional to 646.40, 969.06 and 281.18

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Solution

The fourth proportional to 646.40, 969.06 and 281.18 is: 421.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.40 : 969.06 = 281.18 : x
  2. Step 2: Convert to fraction form
    646.40/969.06 = 281.18/x
  3. Step 3: Cross multiply
    646.40x = 969.06 × 281.18
  4. Step 4: Simplify right side
    646.40x = 272,480.29
  5. Step 5: Solve for x
    x = 272,480.29/646.40
  6. Step 6: Final answer
    x = 421.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.