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Finding the Fourth Proportional to 12,672.39, 19,011.68 and 8,931.47

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Solution

The fourth proportional to 12,672.39, 19,011.68 and 8,931.47 is: 13,399.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,672.39 : 19,011.68 = 8,931.47 : x
  2. Step 2: Convert to fraction form
    12,672.39/19,011.68 = 8,931.47/x
  3. Step 3: Cross multiply
    12,672.39x = 19,011.68 × 8,931.47
  4. Step 4: Simplify right side
    12,672.39x = 169,802,176.84
  5. Step 5: Solve for x
    x = 169,802,176.84/12,672.39
  6. Step 6: Final answer
    x = 13,399.38

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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.