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Finding the Fourth Proportional to 756.09, 1,134.12 and 390.90

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Solution

The fourth proportional to 756.09, 1,134.12 and 390.90 is: 586.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.09 : 1,134.12 = 390.90 : x
  2. Step 2: Convert to fraction form
    756.09/1,134.12 = 390.90/x
  3. Step 3: Cross multiply
    756.09x = 1,134.12 × 390.90
  4. Step 4: Simplify right side
    756.09x = 443,327.51
  5. Step 5: Solve for x
    x = 443,327.51/756.09
  6. Step 6: Final answer
    x = 586.34

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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.