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Finding the Fourth Proportional to 942.24, 1,297.68 and 869.28

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Solution

The fourth proportional to 942.24, 1,297.68 and 869.28 is: 1,197.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.24 : 1,297.68 = 869.28 : x
  2. Step 2: Convert to fraction form
    942.24/1,297.68 = 869.28/x
  3. Step 3: Cross multiply
    942.24x = 1,297.68 × 869.28
  4. Step 4: Simplify right side
    942.24x = 1,128,047.27
  5. Step 5: Solve for x
    x = 1,128,047.27/942.24
  6. Step 6: Final answer
    x = 1,197.20

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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.