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Finding the Fourth Proportional to 438,871.72, 658,240.35 and 139,313.47

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Solution

The fourth proportional to 438,871.72, 658,240.35 and 139,313.47 is: 208,948.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,871.72 : 658,240.35 = 139,313.47 : x
  2. Step 2: Convert to fraction form
    438,871.72/658,240.35 = 139,313.47/x
  3. Step 3: Cross multiply
    438,871.72x = 658,240.35 × 139,313.47
  4. Step 4: Simplify right side
    438,871.72x = 91,701,747,252.51
  5. Step 5: Solve for x
    x = 91,701,747,252.51/438,871.72
  6. Step 6: Final answer
    x = 208,948.86

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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.