Home / 20,928.31-28,880.59-11,368.08

Finding the Fourth Proportional to 20,928.31, 28,880.59 and 11,368.08

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Solution

The fourth proportional to 20,928.31, 28,880.59 and 11,368.08 is: 15,687.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.31 : 28,880.59 = 11,368.08 : x
  2. Step 2: Convert to fraction form
    20,928.31/28,880.59 = 11,368.08/x
  3. Step 3: Cross multiply
    20,928.31x = 28,880.59 × 11,368.08
  4. Step 4: Simplify right side
    20,928.31x = 328,316,857.57
  5. Step 5: Solve for x
    x = 328,316,857.57/20,928.31
  6. Step 6: Final answer
    x = 15,687.69

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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.