Home / 428,968.76-643,436.96-129,441.36

Finding the Fourth Proportional to 428,968.76, 643,436.96 and 129,441.36

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Solution

The fourth proportional to 428,968.76, 643,436.96 and 129,441.36 is: 194,157.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,968.76 : 643,436.96 = 129,441.36 : x
  2. Step 2: Convert to fraction form
    428,968.76/643,436.96 = 129,441.36/x
  3. Step 3: Cross multiply
    428,968.76x = 643,436.96 × 129,441.36
  4. Step 4: Simplify right side
    428,968.76x = 83,287,355,176.67
  5. Step 5: Solve for x
    x = 83,287,355,176.67/428,968.76
  6. Step 6: Final answer
    x = 194,157.16

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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.