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Finding the Fourth Proportional to 753.96, 1,131.06 and 428.66

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Solution

The fourth proportional to 753.96, 1,131.06 and 428.66 is: 643.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.96 : 1,131.06 = 428.66 : x
  2. Step 2: Convert to fraction form
    753.96/1,131.06 = 428.66/x
  3. Step 3: Cross multiply
    753.96x = 1,131.06 × 428.66
  4. Step 4: Simplify right side
    753.96x = 484,834.52
  5. Step 5: Solve for x
    x = 484,834.52/753.96
  6. Step 6: Final answer
    x = 643.05

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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.