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Finding the Fourth Proportional to 218,840.40, 328,030.20 and 85,669.20

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Solution

The fourth proportional to 218,840.40, 328,030.20 and 85,669.20 is: 128,413.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,840.40 : 328,030.20 = 85,669.20 : x
  2. Step 2: Convert to fraction form
    218,840.40/328,030.20 = 85,669.20/x
  3. Step 3: Cross multiply
    218,840.40x = 328,030.20 × 85,669.20
  4. Step 4: Simplify right side
    218,840.40x = 28,102,084,809.84
  5. Step 5: Solve for x
    x = 28,102,084,809.84/218,840.40
  6. Step 6: Final answer
    x = 128,413.61

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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.