Home / 210,205.20-315,089.10-115,289.40

Finding the Fourth Proportional to 210,205.20, 315,089.10 and 115,289.40

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Solution

The fourth proportional to 210,205.20, 315,089.10 and 115,289.40 is: 172,814.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,205.20 : 315,089.10 = 115,289.40 : x
  2. Step 2: Convert to fraction form
    210,205.20/315,089.10 = 115,289.40/x
  3. Step 3: Cross multiply
    210,205.20x = 315,089.10 × 115,289.40
  4. Step 4: Simplify right side
    210,205.20x = 36,326,433,285.54
  5. Step 5: Solve for x
    x = 36,326,433,285.54/210,205.20
  6. Step 6: Final answer
    x = 172,814.15

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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.