Home / 428,974.07-643,465.69-129,457.33

Finding the Fourth Proportional to 428,974.07, 643,465.69 and 129,457.33

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Solution

The fourth proportional to 428,974.07, 643,465.69 and 129,457.33 is: 194,187.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,974.07 : 643,465.69 = 129,457.33 : x
  2. Step 2: Convert to fraction form
    428,974.07/643,465.69 = 129,457.33/x
  3. Step 3: Cross multiply
    428,974.07x = 643,465.69 × 129,457.33
  4. Step 4: Simplify right side
    428,974.07x = 83,301,348,241.70
  5. Step 5: Solve for x
    x = 83,301,348,241.70/428,974.07
  6. Step 6: Final answer
    x = 194,187.38

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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.