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Finding the Fourth Proportional to 1,015.68, 1,400.40 and 720.72

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Solution

The fourth proportional to 1,015.68, 1,400.40 and 720.72 is: 993.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.68 : 1,400.40 = 720.72 : x
  2. Step 2: Convert to fraction form
    1,015.68/1,400.40 = 720.72/x
  3. Step 3: Cross multiply
    1,015.68x = 1,400.40 × 720.72
  4. Step 4: Simplify right side
    1,015.68x = 1,009,296.29
  5. Step 5: Solve for x
    x = 1,009,296.29/1,015.68
  6. Step 6: Final answer
    x = 993.71

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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.