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Finding the Fourth Proportional to 18,921.40, 26,116.02 and 10,967.98

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Solution

The fourth proportional to 18,921.40, 26,116.02 and 10,967.98 is: 15,138.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.40 : 26,116.02 = 10,967.98 : x
  2. Step 2: Convert to fraction form
    18,921.40/26,116.02 = 10,967.98/x
  3. Step 3: Cross multiply
    18,921.40x = 26,116.02 × 10,967.98
  4. Step 4: Simplify right side
    18,921.40x = 286,439,985.04
  5. Step 5: Solve for x
    x = 286,439,985.04/18,921.40
  6. Step 6: Final answer
    x = 15,138.41

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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.