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Finding the Fourth Proportional to 435.71, 653.63 and 139.23

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Solution

The fourth proportional to 435.71, 653.63 and 139.23 is: 208.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.71 : 653.63 = 139.23 : x
  2. Step 2: Convert to fraction form
    435.71/653.63 = 139.23/x
  3. Step 3: Cross multiply
    435.71x = 653.63 × 139.23
  4. Step 4: Simplify right side
    435.71x = 91,004.21
  5. Step 5: Solve for x
    x = 91,004.21/435.71
  6. Step 6: Final answer
    x = 208.86

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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.