Home / 136,688.40-205,090.20-74,403.60

Finding the Fourth Proportional to 136,688.40, 205,090.20 and 74,403.60

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Solution

The fourth proportional to 136,688.40, 205,090.20 and 74,403.60 is: 111,636.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,688.40 : 205,090.20 = 74,403.60 : x
  2. Step 2: Convert to fraction form
    136,688.40/205,090.20 = 74,403.60/x
  3. Step 3: Cross multiply
    136,688.40x = 205,090.20 × 74,403.60
  4. Step 4: Simplify right side
    136,688.40x = 15,259,449,204.72
  5. Step 5: Solve for x
    x = 15,259,449,204.72/136,688.40
  6. Step 6: Final answer
    x = 111,636.75

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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.