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Finding the Fourth Proportional to 438,620.51, 657,954.25 and 139,123.82

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Solution

The fourth proportional to 438,620.51, 657,954.25 and 139,123.82 is: 208,693.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,620.51 : 657,954.25 = 139,123.82 : x
  2. Step 2: Convert to fraction form
    438,620.51/657,954.25 = 139,123.82/x
  3. Step 3: Cross multiply
    438,620.51x = 657,954.25 × 139,123.82
  4. Step 4: Simplify right side
    438,620.51x = 91,537,105,007.65
  5. Step 5: Solve for x
    x = 91,537,105,007.65/438,620.51
  6. Step 6: Final answer
    x = 208,693.17

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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.