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Finding the Fourth Proportional to 18,699.12, 28,055.40 and 9,338.40

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Solution

The fourth proportional to 18,699.12, 28,055.40 and 9,338.40 is: 14,010.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,699.12 : 28,055.40 = 9,338.40 : x
  2. Step 2: Convert to fraction form
    18,699.12/28,055.40 = 9,338.40/x
  3. Step 3: Cross multiply
    18,699.12x = 28,055.40 × 9,338.40
  4. Step 4: Simplify right side
    18,699.12x = 261,992,547.36
  5. Step 5: Solve for x
    x = 261,992,547.36/18,699.12
  6. Step 6: Final answer
    x = 14,010.96

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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.