Home / 428,958.02-643,420.85-129,430.61

Finding the Fourth Proportional to 428,958.02, 643,420.85 and 129,430.61

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Solution

The fourth proportional to 428,958.02, 643,420.85 and 129,430.61 is: 194,141.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,958.02 : 643,420.85 = 129,430.61 : x
  2. Step 2: Convert to fraction form
    428,958.02/643,420.85 = 129,430.61/x
  3. Step 3: Cross multiply
    428,958.02x = 643,420.85 × 129,430.61
  4. Step 4: Simplify right side
    428,958.02x = 83,278,349,237.96
  5. Step 5: Solve for x
    x = 83,278,349,237.96/428,958.02
  6. Step 6: Final answer
    x = 194,141.03

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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.