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Finding the Fourth Proportional to 311,390.15, 429,270.50 and 221,810.63

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Solution

The fourth proportional to 311,390.15, 429,270.50 and 221,810.63 is: 305,779.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,390.15 : 429,270.50 = 221,810.63 : x
  2. Step 2: Convert to fraction form
    311,390.15/429,270.50 = 221,810.63/x
  3. Step 3: Cross multiply
    311,390.15x = 429,270.50 × 221,810.63
  4. Step 4: Simplify right side
    311,390.15x = 95,216,758,453.59
  5. Step 5: Solve for x
    x = 95,216,758,453.59/311,390.15
  6. Step 6: Final answer
    x = 305,779.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.