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Finding the Fourth Proportional to 968.42, 1,455.51 and 455.78

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Solution

The fourth proportional to 968.42, 1,455.51 and 455.78 is: 685.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.42 : 1,455.51 = 455.78 : x
  2. Step 2: Convert to fraction form
    968.42/1,455.51 = 455.78/x
  3. Step 3: Cross multiply
    968.42x = 1,455.51 × 455.78
  4. Step 4: Simplify right side
    968.42x = 663,392.35
  5. Step 5: Solve for x
    x = 663,392.35/968.42
  6. Step 6: Final answer
    x = 685.03

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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.