Home / 207,511.40-311,558.70-128,779.40

Finding the Fourth Proportional to 207,511.40, 311,558.70 and 128,779.40

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Solution

The fourth proportional to 207,511.40, 311,558.70 and 128,779.40 is: 193,350.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,511.40 : 311,558.70 = 128,779.40 : x
  2. Step 2: Convert to fraction form
    207,511.40/311,558.70 = 128,779.40/x
  3. Step 3: Cross multiply
    207,511.40x = 311,558.70 × 128,779.40
  4. Step 4: Simplify right side
    207,511.40x = 40,122,342,450.78
  5. Step 5: Solve for x
    x = 40,122,342,450.78/207,511.40
  6. Step 6: Final answer
    x = 193,350.06

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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.