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Finding the Fourth Proportional to 338,908.61, 508,363.83 and 139,088.81

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Solution

The fourth proportional to 338,908.61, 508,363.83 and 139,088.81 is: 208,633.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,908.61 : 508,363.83 = 139,088.81 : x
  2. Step 2: Convert to fraction form
    338,908.61/508,363.83 = 139,088.81/x
  3. Step 3: Cross multiply
    338,908.61x = 508,363.83 × 139,088.81
  4. Step 4: Simplify right side
    338,908.61x = 70,707,721,432.65
  5. Step 5: Solve for x
    x = 70,707,721,432.65/338,908.61
  6. Step 6: Final answer
    x = 208,633.59

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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.