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Finding the Fourth Proportional to 1,053.16, 1,452.58 and 721.64

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Solution

The fourth proportional to 1,053.16, 1,452.58 and 721.64 is: 995.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.16 : 1,452.58 = 721.64 : x
  2. Step 2: Convert to fraction form
    1,053.16/1,452.58 = 721.64/x
  3. Step 3: Cross multiply
    1,053.16x = 1,452.58 × 721.64
  4. Step 4: Simplify right side
    1,053.16x = 1,048,239.83
  5. Step 5: Solve for x
    x = 1,048,239.83/1,053.16
  6. Step 6: Final answer
    x = 995.33

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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.