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Finding the Fourth Proportional to 1,170.58, 1,755.68 and 390.55

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Solution

The fourth proportional to 1,170.58, 1,755.68 and 390.55 is: 585.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.58 : 1,755.68 = 390.55 : x
  2. Step 2: Convert to fraction form
    1,170.58/1,755.68 = 390.55/x
  3. Step 3: Cross multiply
    1,170.58x = 1,755.68 × 390.55
  4. Step 4: Simplify right side
    1,170.58x = 685,672.84
  5. Step 5: Solve for x
    x = 685,672.84/1,170.58
  6. Step 6: Final answer
    x = 585.76

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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.