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Finding the Fourth Proportional to 1,621.42, 2,432.79 and 755.20

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Solution

The fourth proportional to 1,621.42, 2,432.79 and 755.20 is: 1,133.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.42 : 2,432.79 = 755.20 : x
  2. Step 2: Convert to fraction form
    1,621.42/2,432.79 = 755.20/x
  3. Step 3: Cross multiply
    1,621.42x = 2,432.79 × 755.20
  4. Step 4: Simplify right side
    1,621.42x = 1,837,243.01
  5. Step 5: Solve for x
    x = 1,837,243.01/1,621.42
  6. Step 6: Final answer
    x = 1,133.11

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1.5x scale

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.