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Finding the Fourth Proportional to 1,170.45, 1,755.68 and 390.15

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Solution

The fourth proportional to 1,170.45, 1,755.68 and 390.15 is: 585.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.45 : 1,755.68 = 390.15 : x
  2. Step 2: Convert to fraction form
    1,170.45/1,755.68 = 390.15/x
  3. Step 3: Cross multiply
    1,170.45x = 1,755.68 × 390.15
  4. Step 4: Simplify right side
    1,170.45x = 684,976.60
  5. Step 5: Solve for x
    x = 684,976.60/1,170.45
  6. Step 6: Final answer
    x = 585.23

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Half scale
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Double scale
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Similar ratio
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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.