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Finding the Fourth Proportional to 18,685.44, 28,036.32 and 9,918.24

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Solution

The fourth proportional to 18,685.44, 28,036.32 and 9,918.24 is: 14,881.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.44 : 28,036.32 = 9,918.24 : x
  2. Step 2: Convert to fraction form
    18,685.44/28,036.32 = 9,918.24/x
  3. Step 3: Cross multiply
    18,685.44x = 28,036.32 × 9,918.24
  4. Step 4: Simplify right side
    18,685.44x = 278,070,950.48
  5. Step 5: Solve for x
    x = 278,070,950.48/18,685.44
  6. Step 6: Final answer
    x = 14,881.69

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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.