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Finding the Fourth Proportional to 756.58, 1,134.10 and 427.05

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Solution

The fourth proportional to 756.58, 1,134.10 and 427.05 is: 640.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.58 : 1,134.10 = 427.05 : x
  2. Step 2: Convert to fraction form
    756.58/1,134.10 = 427.05/x
  3. Step 3: Cross multiply
    756.58x = 1,134.10 × 427.05
  4. Step 4: Simplify right side
    756.58x = 484,317.41
  5. Step 5: Solve for x
    x = 484,317.41/756.58
  6. Step 6: Final answer
    x = 640.14

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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.