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Finding the Fourth Proportional to 754.40, 1,130.88 and 388.39

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Solution

The fourth proportional to 754.40, 1,130.88 and 388.39 is: 582.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.40 : 1,130.88 = 388.39 : x
  2. Step 2: Convert to fraction form
    754.40/1,130.88 = 388.39/x
  3. Step 3: Cross multiply
    754.40x = 1,130.88 × 388.39
  4. Step 4: Simplify right side
    754.40x = 439,216.83
  5. Step 5: Solve for x
    x = 439,216.83/754.40
  6. Step 6: Final answer
    x = 582.21

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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.