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Finding the Fourth Proportional to 646.99, 969.95 and 256.82

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Solution

The fourth proportional to 646.99, 969.95 and 256.82 is: 385.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.99 : 969.95 = 256.82 : x
  2. Step 2: Convert to fraction form
    646.99/969.95 = 256.82/x
  3. Step 3: Cross multiply
    646.99x = 969.95 × 256.82
  4. Step 4: Simplify right side
    646.99x = 249,103.08
  5. Step 5: Solve for x
    x = 249,103.08/646.99
  6. Step 6: Final answer
    x = 385.02

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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.