Home / 20,915.48-28,853.61-12,954.80

Finding the Fourth Proportional to 20,915.48, 28,853.61 and 12,954.80

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Solution

The fourth proportional to 20,915.48, 28,853.61 and 12,954.80 is: 17,871.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.48 : 28,853.61 = 12,954.80 : x
  2. Step 2: Convert to fraction form
    20,915.48/28,853.61 = 12,954.80/x
  3. Step 3: Cross multiply
    20,915.48x = 28,853.61 × 12,954.80
  4. Step 4: Simplify right side
    20,915.48x = 373,792,746.83
  5. Step 5: Solve for x
    x = 373,792,746.83/20,915.48
  6. Step 6: Final answer
    x = 17,871.58

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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.