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Finding the Fourth Proportional to 245,626, 338,963.88 and 139,642

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Solution

The fourth proportional to 245,626, 338,963.88 and 139,642 is: 192,705.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,626 : 338,963.88 = 139,642 : x
  2. Step 2: Convert to fraction form
    245,626/338,963.88 = 139,642/x
  3. Step 3: Cross multiply
    245,626x = 338,963.88 × 139,642
  4. Step 4: Simplify right side
    245,626x = 47,333,594,130.96
  5. Step 5: Solve for x
    x = 47,333,594,130.96/245,626
  6. Step 6: Final answer
    x = 192,705.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.