Home / 687,761.60-1,031,642.40-214,443.20

Finding the Fourth Proportional to 687,761.60, 1,031,642.40 and 214,443.20

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Solution

The fourth proportional to 687,761.60, 1,031,642.40 and 214,443.20 is: 321,664.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,761.60 : 1,031,642.40 = 214,443.20 : x
  2. Step 2: Convert to fraction form
    687,761.60/1,031,642.40 = 214,443.20/x
  3. Step 3: Cross multiply
    687,761.60x = 1,031,642.40 × 214,443.20
  4. Step 4: Simplify right side
    687,761.60x = 221,228,697,511.68
  5. Step 5: Solve for x
    x = 221,228,697,511.68/687,761.60
  6. Step 6: Final answer
    x = 321,664.80

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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.