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Finding the Fourth Proportional to 438,511.71, 657,790.78 and 139,015.65

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Solution

The fourth proportional to 438,511.71, 657,790.78 and 139,015.65 is: 208,530.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,511.71 : 657,790.78 = 139,015.65 : x
  2. Step 2: Convert to fraction form
    438,511.71/657,790.78 = 139,015.65/x
  3. Step 3: Cross multiply
    438,511.71x = 657,790.78 × 139,015.65
  4. Step 4: Simplify right side
    438,511.71x = 91,443,212,150.63
  5. Step 5: Solve for x
    x = 91,443,212,150.63/438,511.71
  6. Step 6: Final answer
    x = 208,530.84

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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.