Home / 420,985.41-631,520.64-136,664.07

Finding the Fourth Proportional to 420,985.41, 631,520.64 and 136,664.07

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Solution

The fourth proportional to 420,985.41, 631,520.64 and 136,664.07 is: 205,009.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,985.41 : 631,520.64 = 136,664.07 : x
  2. Step 2: Convert to fraction form
    420,985.41/631,520.64 = 136,664.07/x
  3. Step 3: Cross multiply
    420,985.41x = 631,520.64 × 136,664.07
  4. Step 4: Simplify right side
    420,985.41x = 86,306,180,951.40
  5. Step 5: Solve for x
    x = 86,306,180,951.40/420,985.41
  6. Step 6: Final answer
    x = 205,009.91

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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.