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Finding the Fourth Proportional to 894.78, 1,340.93 and 646

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Solution

The fourth proportional to 894.78, 1,340.93 and 646 is: 968.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.78 : 1,340.93 = 646 : x
  2. Step 2: Convert to fraction form
    894.78/1,340.93 = 646/x
  3. Step 3: Cross multiply
    894.78x = 1,340.93 × 646
  4. Step 4: Simplify right side
    894.78x = 866,240.78
  5. Step 5: Solve for x
    x = 866,240.78/894.78
  6. Step 6: Final answer
    x = 968.10

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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.