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Finding the Fourth Proportional to 18,918.51, 28,377.50 and 6,447.22

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Solution

The fourth proportional to 18,918.51, 28,377.50 and 6,447.22 is: 9,670.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.51 : 28,377.50 = 6,447.22 : x
  2. Step 2: Convert to fraction form
    18,918.51/28,377.50 = 6,447.22/x
  3. Step 3: Cross multiply
    18,918.51x = 28,377.50 × 6,447.22
  4. Step 4: Simplify right side
    18,918.51x = 182,955,953.31
  5. Step 5: Solve for x
    x = 182,955,953.31/18,918.51
  6. Step 6: Final answer
    x = 9,670.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.