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Finding the Fourth Proportional to 18,699.91, 28,066.07 and 9,821.50

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Solution

The fourth proportional to 18,699.91, 28,066.07 and 9,821.50 is: 14,740.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,699.91 : 28,066.07 = 9,821.50 : x
  2. Step 2: Convert to fraction form
    18,699.91/28,066.07 = 9,821.50/x
  3. Step 3: Cross multiply
    18,699.91x = 28,066.07 × 9,821.50
  4. Step 4: Simplify right side
    18,699.91x = 275,650,717.07
  5. Step 5: Solve for x
    x = 275,650,717.07/18,699.91
  6. Step 6: Final answer
    x = 14,740.75

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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.