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Finding the Fourth Proportional to 260,085.40, 390,128.10 and 73,072.60

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Solution

The fourth proportional to 260,085.40, 390,128.10 and 73,072.60 is: 109,608.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,085.40 : 390,128.10 = 73,072.60 : x
  2. Step 2: Convert to fraction form
    260,085.40/390,128.10 = 73,072.60/x
  3. Step 3: Cross multiply
    260,085.40x = 390,128.10 × 73,072.60
  4. Step 4: Simplify right side
    260,085.40x = 28,507,674,600.06
  5. Step 5: Solve for x
    x = 28,507,674,600.06/260,085.40
  6. Step 6: Final answer
    x = 109,608.90

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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.