Home / 20,990.76-28,968.89-11,561.01

Finding the Fourth Proportional to 20,990.76, 28,968.89 and 11,561.01

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Solution

The fourth proportional to 20,990.76, 28,968.89 and 11,561.01 is: 15,955.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.76 : 28,968.89 = 11,561.01 : x
  2. Step 2: Convert to fraction form
    20,990.76/28,968.89 = 11,561.01/x
  3. Step 3: Cross multiply
    20,990.76x = 28,968.89 × 11,561.01
  4. Step 4: Simplify right side
    20,990.76x = 334,909,569.17
  5. Step 5: Solve for x
    x = 334,909,569.17/20,990.76
  6. Step 6: Final answer
    x = 15,955.09

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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.