Home / 428,320.75-642,029-143,741.47

Finding the Fourth Proportional to 428,320.75, 642,029 and 143,741.47

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Solution

The fourth proportional to 428,320.75, 642,029 and 143,741.47 is: 215,460.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,320.75 : 642,029 = 143,741.47 : x
  2. Step 2: Convert to fraction form
    428,320.75/642,029 = 143,741.47/x
  3. Step 3: Cross multiply
    428,320.75x = 642,029 × 143,741.47
  4. Step 4: Simplify right side
    428,320.75x = 92,286,192,242.63
  5. Step 5: Solve for x
    x = 92,286,192,242.63/428,320.75
  6. Step 6: Final answer
    x = 215,460.47

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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.