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Finding the Fourth Proportional to 18,988.81, 26,203.77 and 10,921.86

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Solution

The fourth proportional to 18,988.81, 26,203.77 and 10,921.86 is: 15,071.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.81 : 26,203.77 = 10,921.86 : x
  2. Step 2: Convert to fraction form
    18,988.81/26,203.77 = 10,921.86/x
  3. Step 3: Cross multiply
    18,988.81x = 26,203.77 × 10,921.86
  4. Step 4: Simplify right side
    18,988.81x = 286,193,768.19
  5. Step 5: Solve for x
    x = 286,193,768.19/18,988.81
  6. Step 6: Final answer
    x = 15,071.70

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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.