Home / 428,849.34-643,066.02-129,274.08

Finding the Fourth Proportional to 428,849.34, 643,066.02 and 129,274.08

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Solution

The fourth proportional to 428,849.34, 643,066.02 and 129,274.08 is: 193,848.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,849.34 : 643,066.02 = 129,274.08 : x
  2. Step 2: Convert to fraction form
    428,849.34/643,066.02 = 129,274.08/x
  3. Step 3: Cross multiply
    428,849.34x = 643,066.02 × 129,274.08
  4. Step 4: Simplify right side
    428,849.34x = 83,131,768,114.76
  5. Step 5: Solve for x
    x = 83,131,768,114.76/428,849.34
  6. Step 6: Final answer
    x = 193,848.42

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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.