Home / 260,072.09-390,125.13-80,135.45

Finding the Fourth Proportional to 260,072.09, 390,125.13 and 80,135.45

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Solution

The fourth proportional to 260,072.09, 390,125.13 and 80,135.45 is: 120,208.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,072.09 : 390,125.13 = 80,135.45 : x
  2. Step 2: Convert to fraction form
    260,072.09/390,125.13 = 80,135.45/x
  3. Step 3: Cross multiply
    260,072.09x = 390,125.13 × 80,135.45
  4. Step 4: Simplify right side
    260,072.09x = 31,262,850,898.23
  5. Step 5: Solve for x
    x = 31,262,850,898.23/260,072.09
  6. Step 6: Final answer
    x = 120,208.41

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1.5x scale

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.