Home / 428,999.90-643,102.40-158,977.69

Finding the Fourth Proportional to 428,999.90, 643,102.40 and 158,977.69

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Solution

The fourth proportional to 428,999.90, 643,102.40 and 158,977.69 is: 238,319.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,999.90 : 643,102.40 = 158,977.69 : x
  2. Step 2: Convert to fraction form
    428,999.90/643,102.40 = 158,977.69/x
  3. Step 3: Cross multiply
    428,999.90x = 643,102.40 × 158,977.69
  4. Step 4: Simplify right side
    428,999.90x = 102,238,932,775.14
  5. Step 5: Solve for x
    x = 102,238,932,775.14/428,999.90
  6. Step 6: Final answer
    x = 238,319.25

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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.