Home / 21,271.85-31,909.95-8,135.27

Finding the Fourth Proportional to 21,271.85, 31,909.95 and 8,135.27

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Solution

The fourth proportional to 21,271.85, 31,909.95 and 8,135.27 is: 12,203.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,271.85 : 31,909.95 = 8,135.27 : x
  2. Step 2: Convert to fraction form
    21,271.85/31,909.95 = 8,135.27/x
  3. Step 3: Cross multiply
    21,271.85x = 31,909.95 × 8,135.27
  4. Step 4: Simplify right side
    21,271.85x = 259,596,009.67
  5. Step 5: Solve for x
    x = 259,596,009.67/21,271.85
  6. Step 6: Final answer
    x = 12,203.74

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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.