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Finding the Fourth Proportional to 209,987.55, 315,128.95 and 189,910.89

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Solution

The fourth proportional to 209,987.55, 315,128.95 and 189,910.89 is: 284,999.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,987.55 : 315,128.95 = 189,910.89 : x
  2. Step 2: Convert to fraction form
    209,987.55/315,128.95 = 189,910.89/x
  3. Step 3: Cross multiply
    209,987.55x = 315,128.95 × 189,910.89
  4. Step 4: Simplify right side
    209,987.55x = 59,846,416,834.07
  5. Step 5: Solve for x
    x = 59,846,416,834.07/209,987.55
  6. Step 6: Final answer
    x = 284,999.84

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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.