Home / 20,661.06-30,915.05-12,345.60

Finding the Fourth Proportional to 20,661.06, 30,915.05 and 12,345.60

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Solution

The fourth proportional to 20,661.06, 30,915.05 and 12,345.60 is: 18,472.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.06 : 30,915.05 = 12,345.60 : x
  2. Step 2: Convert to fraction form
    20,661.06/30,915.05 = 12,345.60/x
  3. Step 3: Cross multiply
    20,661.06x = 30,915.05 × 12,345.60
  4. Step 4: Simplify right side
    20,661.06x = 381,664,779.55
  5. Step 5: Solve for x
    x = 381,664,779.55/20,661.06
  6. Step 6: Final answer
    x = 18,472.66

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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.