Home / 20,868.16-28,796.80-12,792.64

Finding the Fourth Proportional to 20,868.16, 28,796.80 and 12,792.64

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Solution

The fourth proportional to 20,868.16, 28,796.80 and 12,792.64 is: 17,653.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.16 : 28,796.80 = 12,792.64 : x
  2. Step 2: Convert to fraction form
    20,868.16/28,796.80 = 12,792.64/x
  3. Step 3: Cross multiply
    20,868.16x = 28,796.80 × 12,792.64
  4. Step 4: Simplify right side
    20,868.16x = 368,387,095.55
  5. Step 5: Solve for x
    x = 368,387,095.55/20,868.16
  6. Step 6: Final answer
    x = 17,653.07

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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.