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Finding the Fourth Proportional to 1,170.30, 1,755.42 and 390.31

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Solution

The fourth proportional to 1,170.30, 1,755.42 and 390.31 is: 585.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.30 : 1,755.42 = 390.31 : x
  2. Step 2: Convert to fraction form
    1,170.30/1,755.42 = 390.31/x
  3. Step 3: Cross multiply
    1,170.30x = 1,755.42 × 390.31
  4. Step 4: Simplify right side
    1,170.30x = 685,157.98
  5. Step 5: Solve for x
    x = 685,157.98/1,170.30
  6. Step 6: Final answer
    x = 585.45

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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.