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Finding the Fourth Proportional to 1,171.15, 1,756.34 and 390.94

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Solution

The fourth proportional to 1,171.15, 1,756.34 and 390.94 is: 586.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.15 : 1,756.34 = 390.94 : x
  2. Step 2: Convert to fraction form
    1,171.15/1,756.34 = 390.94/x
  3. Step 3: Cross multiply
    1,171.15x = 1,756.34 × 390.94
  4. Step 4: Simplify right side
    1,171.15x = 686,623.56
  5. Step 5: Solve for x
    x = 686,623.56/1,171.15
  6. Step 6: Final answer
    x = 586.28

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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.