Home / 21,277.72-31,905.90-12,395.92

Finding the Fourth Proportional to 21,277.72, 31,905.90 and 12,395.92

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Solution

The fourth proportional to 21,277.72, 31,905.90 and 12,395.92 is: 18,587.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,277.72 : 31,905.90 = 12,395.92 : x
  2. Step 2: Convert to fraction form
    21,277.72/31,905.90 = 12,395.92/x
  3. Step 3: Cross multiply
    21,277.72x = 31,905.90 × 12,395.92
  4. Step 4: Simplify right side
    21,277.72x = 395,502,983.93
  5. Step 5: Solve for x
    x = 395,502,983.93/21,277.72
  6. Step 6: Final answer
    x = 18,587.66

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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.