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Finding the Fourth Proportional to 954.72, 1,318.80 and 720.44

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Solution

The fourth proportional to 954.72, 1,318.80 and 720.44 is: 995.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.72 : 1,318.80 = 720.44 : x
  2. Step 2: Convert to fraction form
    954.72/1,318.80 = 720.44/x
  3. Step 3: Cross multiply
    954.72x = 1,318.80 × 720.44
  4. Step 4: Simplify right side
    954.72x = 950,116.27
  5. Step 5: Solve for x
    x = 950,116.27/954.72
  6. Step 6: Final answer
    x = 995.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.