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Finding the Fourth Proportional to 1,370.53, 2,055.57 and 640.18

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Solution

The fourth proportional to 1,370.53, 2,055.57 and 640.18 is: 960.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.53 : 2,055.57 = 640.18 : x
  2. Step 2: Convert to fraction form
    1,370.53/2,055.57 = 640.18/x
  3. Step 3: Cross multiply
    1,370.53x = 2,055.57 × 640.18
  4. Step 4: Simplify right side
    1,370.53x = 1,315,934.80
  5. Step 5: Solve for x
    x = 1,315,934.80/1,370.53
  6. Step 6: Final answer
    x = 960.16

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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.