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Finding the Fourth Proportional to 1,170.16, 1,755.06 and 390.18

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Solution

The fourth proportional to 1,170.16, 1,755.06 and 390.18 is: 585.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.16 : 1,755.06 = 390.18 : x
  2. Step 2: Convert to fraction form
    1,170.16/1,755.06 = 390.18/x
  3. Step 3: Cross multiply
    1,170.16x = 1,755.06 × 390.18
  4. Step 4: Simplify right side
    1,170.16x = 684,780.54
  5. Step 5: Solve for x
    x = 684,780.54/1,170.16
  6. Step 6: Final answer
    x = 585.20

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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.