Home / 428,195.32-642,307.56-203,439.76

Finding the Fourth Proportional to 428,195.32, 642,307.56 and 203,439.76

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Solution

The fourth proportional to 428,195.32, 642,307.56 and 203,439.76 is: 305,166.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,195.32 : 642,307.56 = 203,439.76 : x
  2. Step 2: Convert to fraction form
    428,195.32/642,307.56 = 203,439.76/x
  3. Step 3: Cross multiply
    428,195.32x = 642,307.56 × 203,439.76
  4. Step 4: Simplify right side
    428,195.32x = 130,670,895,852.59
  5. Step 5: Solve for x
    x = 130,670,895,852.59/428,195.32
  6. Step 6: Final answer
    x = 305,166.57

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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.