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Finding the Fourth Proportional to 1,170.36, 1,755.36 and 390.42

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Solution

The fourth proportional to 1,170.36, 1,755.36 and 390.42 is: 585.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.36 : 1,755.36 = 390.42 : x
  2. Step 2: Convert to fraction form
    1,170.36/1,755.36 = 390.42/x
  3. Step 3: Cross multiply
    1,170.36x = 1,755.36 × 390.42
  4. Step 4: Simplify right side
    1,170.36x = 685,327.65
  5. Step 5: Solve for x
    x = 685,327.65/1,170.36
  6. Step 6: Final answer
    x = 585.57

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Double scale
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1.5x scale

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.