Home / 20,915.33-28,862.36-12,957.38

Finding the Fourth Proportional to 20,915.33, 28,862.36 and 12,957.38

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Solution

The fourth proportional to 20,915.33, 28,862.36 and 12,957.38 is: 17,880.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.33 : 28,862.36 = 12,957.38 : x
  2. Step 2: Convert to fraction form
    20,915.33/28,862.36 = 12,957.38/x
  3. Step 3: Cross multiply
    20,915.33x = 28,862.36 × 12,957.38
  4. Step 4: Simplify right side
    20,915.33x = 373,980,513.94
  5. Step 5: Solve for x
    x = 373,980,513.94/20,915.33
  6. Step 6: Final answer
    x = 17,880.69

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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.