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Finding the Fourth Proportional to 310,505.40, 428,491.62 and 195,760.80

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Solution

The fourth proportional to 310,505.40, 428,491.62 and 195,760.80 is: 270,146.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,505.40 : 428,491.62 = 195,760.80 : x
  2. Step 2: Convert to fraction form
    310,505.40/428,491.62 = 195,760.80/x
  3. Step 3: Cross multiply
    310,505.40x = 428,491.62 × 195,760.80
  4. Step 4: Simplify right side
    310,505.40x = 83,881,862,324.50
  5. Step 5: Solve for x
    x = 83,881,862,324.50/310,505.40
  6. Step 6: Final answer
    x = 270,146.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.