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Finding the Fourth Proportional to 426,129.98, 638,370.69 and 356,919.81

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Solution

The fourth proportional to 426,129.98, 638,370.69 and 356,919.81 is: 534,689.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,129.98 : 638,370.69 = 356,919.81 : x
  2. Step 2: Convert to fraction form
    426,129.98/638,370.69 = 356,919.81/x
  3. Step 3: Cross multiply
    426,129.98x = 638,370.69 × 356,919.81
  4. Step 4: Simplify right side
    426,129.98x = 227,847,145,384.37
  5. Step 5: Solve for x
    x = 227,847,145,384.37/426,129.98
  6. Step 6: Final answer
    x = 534,689.32

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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.