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Finding the Fourth Proportional to 931.44, 1,395.20 and 747.84

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Solution

The fourth proportional to 931.44, 1,395.20 and 747.84 is: 1,120.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.44 : 1,395.20 = 747.84 : x
  2. Step 2: Convert to fraction form
    931.44/1,395.20 = 747.84/x
  3. Step 3: Cross multiply
    931.44x = 1,395.20 × 747.84
  4. Step 4: Simplify right side
    931.44x = 1,043,386.37
  5. Step 5: Solve for x
    x = 1,043,386.37/931.44
  6. Step 6: Final answer
    x = 1,120.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.