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Finding the Fourth Proportional to 976.95, 1,463.40 and 646.83

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Solution

The fourth proportional to 976.95, 1,463.40 and 646.83 is: 968.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.95 : 1,463.40 = 646.83 : x
  2. Step 2: Convert to fraction form
    976.95/1,463.40 = 646.83/x
  3. Step 3: Cross multiply
    976.95x = 1,463.40 × 646.83
  4. Step 4: Simplify right side
    976.95x = 946,571.02
  5. Step 5: Solve for x
    x = 946,571.02/976.95
  6. Step 6: Final answer
    x = 968.90

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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.