Home / 428,599.08-643,109.04-172,421.28

Finding the Fourth Proportional to 428,599.08, 643,109.04 and 172,421.28

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Solution

The fourth proportional to 428,599.08, 643,109.04 and 172,421.28 is: 258,716.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,599.08 : 643,109.04 = 172,421.28 : x
  2. Step 2: Convert to fraction form
    428,599.08/643,109.04 = 172,421.28/x
  3. Step 3: Cross multiply
    428,599.08x = 643,109.04 × 172,421.28
  4. Step 4: Simplify right side
    428,599.08x = 110,885,683,856.37
  5. Step 5: Solve for x
    x = 110,885,683,856.37/428,599.08
  6. Step 6: Final answer
    x = 258,716.57

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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.