Home / 21,116.32-29,142-11,685.28

Finding the Fourth Proportional to 21,116.32, 29,142 and 11,685.28

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Solution

The fourth proportional to 21,116.32, 29,142 and 11,685.28 is: 16,126.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,116.32 : 29,142 = 11,685.28 : x
  2. Step 2: Convert to fraction form
    21,116.32/29,142 = 11,685.28/x
  3. Step 3: Cross multiply
    21,116.32x = 29,142 × 11,685.28
  4. Step 4: Simplify right side
    21,116.32x = 340,532,429.76
  5. Step 5: Solve for x
    x = 340,532,429.76/21,116.32
  6. Step 6: Final answer
    x = 16,126.50

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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.