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Finding the Fourth Proportional to 988.25, 1,362.47 and 764.54

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Solution

The fourth proportional to 988.25, 1,362.47 and 764.54 is: 1,054.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.25 : 1,362.47 = 764.54 : x
  2. Step 2: Convert to fraction form
    988.25/1,362.47 = 764.54/x
  3. Step 3: Cross multiply
    988.25x = 1,362.47 × 764.54
  4. Step 4: Simplify right side
    988.25x = 1,041,661.59
  5. Step 5: Solve for x
    x = 1,041,661.59/988.25
  6. Step 6: Final answer
    x = 1,054.05

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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.