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Finding the Fourth Proportional to 646.65, 969.80 and 281.35

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Solution

The fourth proportional to 646.65, 969.80 and 281.35 is: 421.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.65 : 969.80 = 281.35 : x
  2. Step 2: Convert to fraction form
    646.65/969.80 = 281.35/x
  3. Step 3: Cross multiply
    646.65x = 969.80 × 281.35
  4. Step 4: Simplify right side
    646.65x = 272,853.23
  5. Step 5: Solve for x
    x = 272,853.23/646.65
  6. Step 6: Final answer
    x = 421.95

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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.