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Finding the Fourth Proportional to 12,390.71, 18,591.53 and 5,009.58

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Solution

The fourth proportional to 12,390.71, 18,591.53 and 5,009.58 is: 7,516.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.71 : 18,591.53 = 5,009.58 : x
  2. Step 2: Convert to fraction form
    12,390.71/18,591.53 = 5,009.58/x
  3. Step 3: Cross multiply
    12,390.71x = 18,591.53 × 5,009.58
  4. Step 4: Simplify right side
    12,390.71x = 93,135,731.81
  5. Step 5: Solve for x
    x = 93,135,731.81/12,390.71
  6. Step 6: Final answer
    x = 7,516.58

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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.