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Finding the Fourth Proportional to 753.21, 1,130.36 and 387.95

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Solution

The fourth proportional to 753.21, 1,130.36 and 387.95 is: 582.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.21 : 1,130.36 = 387.95 : x
  2. Step 2: Convert to fraction form
    753.21/1,130.36 = 387.95/x
  3. Step 3: Cross multiply
    753.21x = 1,130.36 × 387.95
  4. Step 4: Simplify right side
    753.21x = 438,515.57
  5. Step 5: Solve for x
    x = 438,515.57/753.21
  6. Step 6: Final answer
    x = 582.20

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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.