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Finding the Fourth Proportional to 12,639.59, 18,944.63 and 9,509.55

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Solution

The fourth proportional to 12,639.59, 18,944.63 and 9,509.55 is: 14,253.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.59 : 18,944.63 = 9,509.55 : x
  2. Step 2: Convert to fraction form
    12,639.59/18,944.63 = 9,509.55/x
  3. Step 3: Cross multiply
    12,639.59x = 18,944.63 × 9,509.55
  4. Step 4: Simplify right side
    12,639.59x = 180,154,983.34
  5. Step 5: Solve for x
    x = 180,154,983.34/12,639.59
  6. Step 6: Final answer
    x = 14,253.23

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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.