Home / 211,121.40-316,413.30-86,321.40

Finding the Fourth Proportional to 211,121.40, 316,413.30 and 86,321.40

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Solution

The fourth proportional to 211,121.40, 316,413.30 and 86,321.40 is: 129,372.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,121.40 : 316,413.30 = 86,321.40 : x
  2. Step 2: Convert to fraction form
    211,121.40/316,413.30 = 86,321.40/x
  3. Step 3: Cross multiply
    211,121.40x = 316,413.30 × 86,321.40
  4. Step 4: Simplify right side
    211,121.40x = 27,313,239,034.62
  5. Step 5: Solve for x
    x = 27,313,239,034.62/211,121.40
  6. Step 6: Final answer
    x = 129,372.20

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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.