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Finding the Fourth Proportional to 942.78, 1,301.09 and 709.50

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Solution

The fourth proportional to 942.78, 1,301.09 and 709.50 is: 979.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.78 : 1,301.09 = 709.50 : x
  2. Step 2: Convert to fraction form
    942.78/1,301.09 = 709.50/x
  3. Step 3: Cross multiply
    942.78x = 1,301.09 × 709.50
  4. Step 4: Simplify right side
    942.78x = 923,119.81
  5. Step 5: Solve for x
    x = 923,119.81/942.78
  6. Step 6: Final answer
    x = 979.15

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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.