Home / 428,650.66-643,000.29-129,172.60

Finding the Fourth Proportional to 428,650.66, 643,000.29 and 129,172.60

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Solution

The fourth proportional to 428,650.66, 643,000.29 and 129,172.60 is: 193,766.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,650.66 : 643,000.29 = 129,172.60 : x
  2. Step 2: Convert to fraction form
    428,650.66/643,000.29 = 129,172.60/x
  3. Step 3: Cross multiply
    428,650.66x = 643,000.29 × 129,172.60
  4. Step 4: Simplify right side
    428,650.66x = 83,058,015,399.19
  5. Step 5: Solve for x
    x = 83,058,015,399.19/428,650.66
  6. Step 6: Final answer
    x = 193,766.22

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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.