Home / 428,630.76-643,071.24-191,918.04

Finding the Fourth Proportional to 428,630.76, 643,071.24 and 191,918.04

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Solution

The fourth proportional to 428,630.76, 643,071.24 and 191,918.04 is: 287,933.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,630.76 : 643,071.24 = 191,918.04 : x
  2. Step 2: Convert to fraction form
    428,630.76/643,071.24 = 191,918.04/x
  3. Step 3: Cross multiply
    428,630.76x = 643,071.24 × 191,918.04
  4. Step 4: Simplify right side
    428,630.76x = 123,416,971,961.17
  5. Step 5: Solve for x
    x = 123,416,971,961.17/428,630.76
  6. Step 6: Final answer
    x = 287,933.07

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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.