Home / 218,740.32-328,137.84-85,603.38

Finding the Fourth Proportional to 218,740.32, 328,137.84 and 85,603.38

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Solution

The fourth proportional to 218,740.32, 328,137.84 and 85,603.38 is: 128,415.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,740.32 : 328,137.84 = 85,603.38 : x
  2. Step 2: Convert to fraction form
    218,740.32/328,137.84 = 85,603.38/x
  3. Step 3: Cross multiply
    218,740.32x = 328,137.84 × 85,603.38
  4. Step 4: Simplify right side
    218,740.32x = 28,089,708,209.90
  5. Step 5: Solve for x
    x = 28,089,708,209.90/218,740.32
  6. Step 6: Final answer
    x = 128,415.78

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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.