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Finding the Fourth Proportional to 1,178.85, 1,767.85 and 345.69

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Solution

The fourth proportional to 1,178.85, 1,767.85 and 345.69 is: 518.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.85 : 1,767.85 = 345.69 : x
  2. Step 2: Convert to fraction form
    1,178.85/1,767.85 = 345.69/x
  3. Step 3: Cross multiply
    1,178.85x = 1,767.85 × 345.69
  4. Step 4: Simplify right side
    1,178.85x = 611,128.07
  5. Step 5: Solve for x
    x = 611,128.07/1,178.85
  6. Step 6: Final answer
    x = 518.41

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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.