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Finding the Fourth Proportional to 988.89, 1,362.24 and 767.45

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Solution

The fourth proportional to 988.89, 1,362.24 and 767.45 is: 1,057.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.89 : 1,362.24 = 767.45 : x
  2. Step 2: Convert to fraction form
    988.89/1,362.24 = 767.45/x
  3. Step 3: Cross multiply
    988.89x = 1,362.24 × 767.45
  4. Step 4: Simplify right side
    988.89x = 1,045,444.28
  5. Step 5: Solve for x
    x = 1,045,444.28/988.89
  6. Step 6: Final answer
    x = 1,057.19

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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.