Home / 21,267.36-31,890.44-12,385.68

Finding the Fourth Proportional to 21,267.36, 31,890.44 and 12,385.68

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Solution

The fourth proportional to 21,267.36, 31,890.44 and 12,385.68 is: 18,572.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,267.36 : 31,890.44 = 12,385.68 : x
  2. Step 2: Convert to fraction form
    21,267.36/31,890.44 = 12,385.68/x
  3. Step 3: Cross multiply
    21,267.36x = 31,890.44 × 12,385.68
  4. Step 4: Simplify right side
    21,267.36x = 394,984,784.90
  5. Step 5: Solve for x
    x = 394,984,784.90/21,267.36
  6. Step 6: Final answer
    x = 18,572.35

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1.5x scale

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.