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Finding the Fourth Proportional to 985.44, 1,474.96 and 755.20

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Solution

The fourth proportional to 985.44, 1,474.96 and 755.20 is: 1,130.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.44 : 1,474.96 = 755.20 : x
  2. Step 2: Convert to fraction form
    985.44/1,474.96 = 755.20/x
  3. Step 3: Cross multiply
    985.44x = 1,474.96 × 755.20
  4. Step 4: Simplify right side
    985.44x = 1,113,889.79
  5. Step 5: Solve for x
    x = 1,113,889.79/985.44
  6. Step 6: Final answer
    x = 1,130.35

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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.