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Finding the Fourth Proportional to 18,969.17, 28,462.41 and 7,878.35

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Solution

The fourth proportional to 18,969.17, 28,462.41 and 7,878.35 is: 11,821.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.17 : 28,462.41 = 7,878.35 : x
  2. Step 2: Convert to fraction form
    18,969.17/28,462.41 = 7,878.35/x
  3. Step 3: Cross multiply
    18,969.17x = 28,462.41 × 7,878.35
  4. Step 4: Simplify right side
    18,969.17x = 224,236,685.51
  5. Step 5: Solve for x
    x = 224,236,685.51/18,969.17
  6. Step 6: Final answer
    x = 11,821.12

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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.