Home / 20,987.31-28,962.32-11,555.55

Finding the Fourth Proportional to 20,987.31, 28,962.32 and 11,555.55

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Solution

The fourth proportional to 20,987.31, 28,962.32 and 11,555.55 is: 15,946.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.31 : 28,962.32 = 11,555.55 : x
  2. Step 2: Convert to fraction form
    20,987.31/28,962.32 = 11,555.55/x
  3. Step 3: Cross multiply
    20,987.31x = 28,962.32 × 11,555.55
  4. Step 4: Simplify right side
    20,987.31x = 334,675,479.10
  5. Step 5: Solve for x
    x = 334,675,479.10/20,987.31
  6. Step 6: Final answer
    x = 15,946.56

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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.