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Finding the Fourth Proportional to 209,955.10, 315,005.55 and 91,711.30

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Solution

The fourth proportional to 209,955.10, 315,005.55 and 91,711.30 is: 137,598.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,955.10 : 315,005.55 = 91,711.30 : x
  2. Step 2: Convert to fraction form
    209,955.10/315,005.55 = 91,711.30/x
  3. Step 3: Cross multiply
    209,955.10x = 315,005.55 × 91,711.30
  4. Step 4: Simplify right side
    209,955.10x = 28,889,568,497.72
  5. Step 5: Solve for x
    x = 28,889,568,497.72/209,955.10
  6. Step 6: Final answer
    x = 137,598.79

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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.