Home / 428,869.28-643,513.51-303,316.35

Finding the Fourth Proportional to 428,869.28, 643,513.51 and 303,316.35

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Solution

The fourth proportional to 428,869.28, 643,513.51 and 303,316.35 is: 455,122.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,869.28 : 643,513.51 = 303,316.35 : x
  2. Step 2: Convert to fraction form
    428,869.28/643,513.51 = 303,316.35/x
  3. Step 3: Cross multiply
    428,869.28x = 643,513.51 × 303,316.35
  4. Step 4: Simplify right side
    428,869.28x = 195,188,166,994.86
  5. Step 5: Solve for x
    x = 195,188,166,994.86/428,869.28
  6. Step 6: Final answer
    x = 455,122.75

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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.