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Finding the Fourth Proportional to 103,719.80, 155,349.30 and 85,287.80

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Solution

The fourth proportional to 103,719.80, 155,349.30 and 85,287.80 is: 127,742.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,719.80 : 155,349.30 = 85,287.80 : x
  2. Step 2: Convert to fraction form
    103,719.80/155,349.30 = 85,287.80/x
  3. Step 3: Cross multiply
    103,719.80x = 155,349.30 × 85,287.80
  4. Step 4: Simplify right side
    103,719.80x = 13,249,400,028.54
  5. Step 5: Solve for x
    x = 13,249,400,028.54/103,719.80
  6. Step 6: Final answer
    x = 127,742.24

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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.