Home / 260,069.09-390,120.63-80,132.45

Finding the Fourth Proportional to 260,069.09, 390,120.63 and 80,132.45

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Solution

The fourth proportional to 260,069.09, 390,120.63 and 80,132.45 is: 120,203.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,069.09 : 390,120.63 = 80,132.45 : x
  2. Step 2: Convert to fraction form
    260,069.09/390,120.63 = 80,132.45/x
  3. Step 3: Cross multiply
    260,069.09x = 390,120.63 × 80,132.45
  4. Step 4: Simplify right side
    260,069.09x = 31,261,319,926.84
  5. Step 5: Solve for x
    x = 31,261,319,926.84/260,069.09
  6. Step 6: Final answer
    x = 120,203.91

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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.