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Finding the Fourth Proportional to 388,484.43, 582,726.65 and 139,341.39

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Solution

The fourth proportional to 388,484.43, 582,726.65 and 139,341.39 is: 209,012.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,484.43 : 582,726.65 = 139,341.39 : x
  2. Step 2: Convert to fraction form
    388,484.43/582,726.65 = 139,341.39/x
  3. Step 3: Cross multiply
    388,484.43x = 582,726.65 × 139,341.39
  4. Step 4: Simplify right side
    388,484.43x = 81,197,940,704.34
  5. Step 5: Solve for x
    x = 81,197,940,704.34/388,484.43
  6. Step 6: Final answer
    x = 209,012.09

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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.