Home / 20,987.51-28,962.63-11,556

Finding the Fourth Proportional to 20,987.51, 28,962.63 and 11,556

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Solution

The fourth proportional to 20,987.51, 28,962.63 and 11,556 is: 15,947.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.51 : 28,962.63 = 11,556 : x
  2. Step 2: Convert to fraction form
    20,987.51/28,962.63 = 11,556/x
  3. Step 3: Cross multiply
    20,987.51x = 28,962.63 × 11,556
  4. Step 4: Simplify right side
    20,987.51x = 334,692,152.28
  5. Step 5: Solve for x
    x = 334,692,152.28/20,987.51
  6. Step 6: Final answer
    x = 15,947.21

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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.