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Finding the Fourth Proportional to 18,718, 28,085.20 and 8,864.32

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Solution

The fourth proportional to 18,718, 28,085.20 and 8,864.32 is: 13,300.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718 : 28,085.20 = 8,864.32 : x
  2. Step 2: Convert to fraction form
    18,718/28,085.20 = 8,864.32/x
  3. Step 3: Cross multiply
    18,718x = 28,085.20 × 8,864.32
  4. Step 4: Simplify right side
    18,718x = 248,956,200.06
  5. Step 5: Solve for x
    x = 248,956,200.06/18,718
  6. Step 6: Final answer
    x = 13,300.36

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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.