Home / 428,071.20-642,149.28-158,270.01

Finding the Fourth Proportional to 428,071.20, 642,149.28 and 158,270.01

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Solution

The fourth proportional to 428,071.20, 642,149.28 and 158,270.01 is: 237,420.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,071.20 : 642,149.28 = 158,270.01 : x
  2. Step 2: Convert to fraction form
    428,071.20/642,149.28 = 158,270.01/x
  3. Step 3: Cross multiply
    428,071.20x = 642,149.28 × 158,270.01
  4. Step 4: Simplify right side
    428,071.20x = 101,632,972,967.09
  5. Step 5: Solve for x
    x = 101,632,972,967.09/428,071.20
  6. Step 6: Final answer
    x = 237,420.72

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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.