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Finding the Fourth Proportional to 425,619.80, 638,429.70 and 215,667.80

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Solution

The fourth proportional to 425,619.80, 638,429.70 and 215,667.80 is: 323,501.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,619.80 : 638,429.70 = 215,667.80 : x
  2. Step 2: Convert to fraction form
    425,619.80/638,429.70 = 215,667.80/x
  3. Step 3: Cross multiply
    425,619.80x = 638,429.70 × 215,667.80
  4. Step 4: Simplify right side
    425,619.80x = 137,688,728,853.66
  5. Step 5: Solve for x
    x = 137,688,728,853.66/425,619.80
  6. Step 6: Final answer
    x = 323,501.70

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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.