Home / 21,239.19-31,840.33-12,455.65

Finding the Fourth Proportional to 21,239.19, 31,840.33 and 12,455.65

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Solution

The fourth proportional to 21,239.19, 31,840.33 and 12,455.65 is: 18,672.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.19 : 31,840.33 = 12,455.65 : x
  2. Step 2: Convert to fraction form
    21,239.19/31,840.33 = 12,455.65/x
  3. Step 3: Cross multiply
    21,239.19x = 31,840.33 × 12,455.65
  4. Step 4: Simplify right side
    21,239.19x = 396,591,931.31
  5. Step 5: Solve for x
    x = 396,591,931.31/21,239.19
  6. Step 6: Final answer
    x = 18,672.65

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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.