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Finding the Fourth Proportional to 18,918.40, 28,519.28 and 17,649.76

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Solution

The fourth proportional to 18,918.40, 28,519.28 and 17,649.76 is: 26,606.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.40 : 28,519.28 = 17,649.76 : x
  2. Step 2: Convert to fraction form
    18,918.40/28,519.28 = 17,649.76/x
  3. Step 3: Cross multiply
    18,918.40x = 28,519.28 × 17,649.76
  4. Step 4: Simplify right side
    18,918.40x = 503,358,447.37
  5. Step 5: Solve for x
    x = 503,358,447.37/18,918.40
  6. Step 6: Final answer
    x = 26,606.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.