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Finding the Fourth Proportional to 646.53, 969.86 and 281.35

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Solution

The fourth proportional to 646.53, 969.86 and 281.35 is: 422.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.53 : 969.86 = 281.35 : x
  2. Step 2: Convert to fraction form
    646.53/969.86 = 281.35/x
  3. Step 3: Cross multiply
    646.53x = 969.86 × 281.35
  4. Step 4: Simplify right side
    646.53x = 272,870.11
  5. Step 5: Solve for x
    x = 272,870.11/646.53
  6. Step 6: Final answer
    x = 422.05

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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.