Home / 428,066.08-642,104.50-128,529.22

Finding the Fourth Proportional to 428,066.08, 642,104.50 and 128,529.22

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Solution

The fourth proportional to 428,066.08, 642,104.50 and 128,529.22 is: 192,795.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,066.08 : 642,104.50 = 128,529.22 : x
  2. Step 2: Convert to fraction form
    428,066.08/642,104.50 = 128,529.22/x
  3. Step 3: Cross multiply
    428,066.08x = 642,104.50 × 128,529.22
  4. Step 4: Simplify right side
    428,066.08x = 82,529,190,543.49
  5. Step 5: Solve for x
    x = 82,529,190,543.49/428,066.08
  6. Step 6: Final answer
    x = 192,795.45

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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.