Home / 20,943-28,901.40-11,990.64

Finding the Fourth Proportional to 20,943, 28,901.40 and 11,990.64

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Solution

The fourth proportional to 20,943, 28,901.40 and 11,990.64 is: 16,547.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,943 : 28,901.40 = 11,990.64 : x
  2. Step 2: Convert to fraction form
    20,943/28,901.40 = 11,990.64/x
  3. Step 3: Cross multiply
    20,943x = 28,901.40 × 11,990.64
  4. Step 4: Simplify right side
    20,943x = 346,546,282.90
  5. Step 5: Solve for x
    x = 346,546,282.90/20,943
  6. Step 6: Final answer
    x = 16,547.12

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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.