Home / 21,211.72-31,775.15-12,773.55

Finding the Fourth Proportional to 21,211.72, 31,775.15 and 12,773.55

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Solution

The fourth proportional to 21,211.72, 31,775.15 and 12,773.55 is: 19,134.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,211.72 : 31,775.15 = 12,773.55 : x
  2. Step 2: Convert to fraction form
    21,211.72/31,775.15 = 12,773.55/x
  3. Step 3: Cross multiply
    21,211.72x = 31,775.15 × 12,773.55
  4. Step 4: Simplify right side
    21,211.72x = 405,881,467.28
  5. Step 5: Solve for x
    x = 405,881,467.28/21,211.72
  6. Step 6: Final answer
    x = 19,134.77

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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.