Home / 20,988-28,962.76-11,556.32

Finding the Fourth Proportional to 20,988, 28,962.76 and 11,556.32

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Solution

The fourth proportional to 20,988, 28,962.76 and 11,556.32 is: 15,947.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988 : 28,962.76 = 11,556.32 : x
  2. Step 2: Convert to fraction form
    20,988/28,962.76 = 11,556.32/x
  3. Step 3: Cross multiply
    20,988x = 28,962.76 × 11,556.32
  4. Step 4: Simplify right side
    20,988x = 334,702,922.64
  5. Step 5: Solve for x
    x = 334,702,922.64/20,988
  6. Step 6: Final answer
    x = 15,947.35

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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.