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Finding the Fourth Proportional to 1,015.08, 1,400.69 and 720.24

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Solution

The fourth proportional to 1,015.08, 1,400.69 and 720.24 is: 993.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.08 : 1,400.69 = 720.24 : x
  2. Step 2: Convert to fraction form
    1,015.08/1,400.69 = 720.24/x
  3. Step 3: Cross multiply
    1,015.08x = 1,400.69 × 720.24
  4. Step 4: Simplify right side
    1,015.08x = 1,008,829.36
  5. Step 5: Solve for x
    x = 1,008,829.36/1,015.08
  6. Step 6: Final answer
    x = 993.84

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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.