Home / 21,078.81-29,102.32-13,528.39

Finding the Fourth Proportional to 21,078.81, 29,102.32 and 13,528.39

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Solution

The fourth proportional to 21,078.81, 29,102.32 and 13,528.39 is: 18,677.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.81 : 29,102.32 = 13,528.39 : x
  2. Step 2: Convert to fraction form
    21,078.81/29,102.32 = 13,528.39/x
  3. Step 3: Cross multiply
    21,078.81x = 29,102.32 × 13,528.39
  4. Step 4: Simplify right side
    21,078.81x = 393,707,534.86
  5. Step 5: Solve for x
    x = 393,707,534.86/21,078.81
  6. Step 6: Final answer
    x = 18,677.88

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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.