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Finding the Fourth Proportional to 12,685.91, 19,000.99 and 10,459.65

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Solution

The fourth proportional to 12,685.91, 19,000.99 and 10,459.65 is: 15,666.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,685.91 : 19,000.99 = 10,459.65 : x
  2. Step 2: Convert to fraction form
    12,685.91/19,000.99 = 10,459.65/x
  3. Step 3: Cross multiply
    12,685.91x = 19,000.99 × 10,459.65
  4. Step 4: Simplify right side
    12,685.91x = 198,743,678.90
  5. Step 5: Solve for x
    x = 198,743,678.90/12,685.91
  6. Step 6: Final answer
    x = 15,666.50

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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.