Home / 428,221.17-642,156.78-147,672.81

Finding the Fourth Proportional to 428,221.17, 642,156.78 and 147,672.81

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Solution

The fourth proportional to 428,221.17, 642,156.78 and 147,672.81 is: 221,448.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,221.17 : 642,156.78 = 147,672.81 : x
  2. Step 2: Convert to fraction form
    428,221.17/642,156.78 = 147,672.81/x
  3. Step 3: Cross multiply
    428,221.17x = 642,156.78 × 147,672.81
  4. Step 4: Simplify right side
    428,221.17x = 94,829,096,163.15
  5. Step 5: Solve for x
    x = 94,829,096,163.15/428,221.17
  6. Step 6: Final answer
    x = 221,448.87

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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.