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Finding the Fourth Proportional to 209,988.55, 315,130.45 and 189,911.89

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Solution

The fourth proportional to 209,988.55, 315,130.45 and 189,911.89 is: 285,001.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,988.55 : 315,130.45 = 189,911.89 : x
  2. Step 2: Convert to fraction form
    209,988.55/315,130.45 = 189,911.89/x
  3. Step 3: Cross multiply
    209,988.55x = 315,130.45 × 189,911.89
  4. Step 4: Simplify right side
    209,988.55x = 59,847,019,356.05
  5. Step 5: Solve for x
    x = 59,847,019,356.05/209,988.55
  6. Step 6: Final answer
    x = 285,001.35

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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.