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Finding the Fourth Proportional to 976.48, 1,461.80 and 720.16

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Solution

The fourth proportional to 976.48, 1,461.80 and 720.16 is: 1,078.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.48 : 1,461.80 = 720.16 : x
  2. Step 2: Convert to fraction form
    976.48/1,461.80 = 720.16/x
  3. Step 3: Cross multiply
    976.48x = 1,461.80 × 720.16
  4. Step 4: Simplify right side
    976.48x = 1,052,729.89
  5. Step 5: Solve for x
    x = 1,052,729.89/976.48
  6. Step 6: Final answer
    x = 1,078.09

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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.