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Finding the Fourth Proportional to 12,605.79, 18,919.61 and 12,576.63

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Solution

The fourth proportional to 12,605.79, 18,919.61 and 12,576.63 is: 18,875.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,605.79 : 18,919.61 = 12,576.63 : x
  2. Step 2: Convert to fraction form
    12,605.79/18,919.61 = 12,576.63/x
  3. Step 3: Cross multiply
    12,605.79x = 18,919.61 × 12,576.63
  4. Step 4: Simplify right side
    12,605.79x = 237,944,934.71
  5. Step 5: Solve for x
    x = 237,944,934.71/12,605.79
  6. Step 6: Final answer
    x = 18,875.84

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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.