Home / 20,953.89-28,915.52-12,455.91

Finding the Fourth Proportional to 20,953.89, 28,915.52 and 12,455.91

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Solution

The fourth proportional to 20,953.89, 28,915.52 and 12,455.91 is: 17,188.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,953.89 : 28,915.52 = 12,455.91 : x
  2. Step 2: Convert to fraction form
    20,953.89/28,915.52 = 12,455.91/x
  3. Step 3: Cross multiply
    20,953.89x = 28,915.52 × 12,455.91
  4. Step 4: Simplify right side
    20,953.89x = 360,169,052.44
  5. Step 5: Solve for x
    x = 360,169,052.44/20,953.89
  6. Step 6: Final answer
    x = 17,188.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.