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Finding the Fourth Proportional to 12,999.70, 19,499.55 and 10,812.70

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Solution

The fourth proportional to 12,999.70, 19,499.55 and 10,812.70 is: 16,219.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,999.70 : 19,499.55 = 10,812.70 : x
  2. Step 2: Convert to fraction form
    12,999.70/19,499.55 = 10,812.70/x
  3. Step 3: Cross multiply
    12,999.70x = 19,499.55 × 10,812.70
  4. Step 4: Simplify right side
    12,999.70x = 210,842,784.29
  5. Step 5: Solve for x
    x = 210,842,784.29/12,999.70
  6. Step 6: Final answer
    x = 16,219.05

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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.