Home / 428,419.80-642,500.17-128,820.85

Finding the Fourth Proportional to 428,419.80, 642,500.17 and 128,820.85

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Solution

The fourth proportional to 428,419.80, 642,500.17 and 128,820.85 is: 193,192.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,419.80 : 642,500.17 = 128,820.85 : x
  2. Step 2: Convert to fraction form
    428,419.80/642,500.17 = 128,820.85/x
  3. Step 3: Cross multiply
    428,419.80x = 642,500.17 × 128,820.85
  4. Step 4: Simplify right side
    428,419.80x = 82,767,416,096.24
  5. Step 5: Solve for x
    x = 82,767,416,096.24/428,419.80
  6. Step 6: Final answer
    x = 193,192.32

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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.