Home / 420,890.39-631,428.87-121,347.60

Finding the Fourth Proportional to 420,890.39, 631,428.87 and 121,347.60

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Solution

The fourth proportional to 420,890.39, 631,428.87 and 121,347.60 is: 182,048.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,890.39 : 631,428.87 = 121,347.60 : x
  2. Step 2: Convert to fraction form
    420,890.39/631,428.87 = 121,347.60/x
  3. Step 3: Cross multiply
    420,890.39x = 631,428.87 × 121,347.60
  4. Step 4: Simplify right side
    420,890.39x = 76,622,376,032.41
  5. Step 5: Solve for x
    x = 76,622,376,032.41/420,890.39
  6. Step 6: Final answer
    x = 182,048.29

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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.