Home / 428,121.30-642,311.52-161,963.40

Finding the Fourth Proportional to 428,121.30, 642,311.52 and 161,963.40

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Solution

The fourth proportional to 428,121.30, 642,311.52 and 161,963.40 is: 242,994.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,121.30 : 642,311.52 = 161,963.40 : x
  2. Step 2: Convert to fraction form
    428,121.30/642,311.52 = 161,963.40/x
  3. Step 3: Cross multiply
    428,121.30x = 642,311.52 × 161,963.40
  4. Step 4: Simplify right side
    428,121.30x = 104,030,957,638.37
  5. Step 5: Solve for x
    x = 104,030,957,638.37/428,121.30
  6. Step 6: Final answer
    x = 242,994.12

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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.