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Finding the Fourth Proportional to 12,390.60, 18,588.30 and 5,370.60

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Solution

The fourth proportional to 12,390.60, 18,588.30 and 5,370.60 is: 8,056.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.60 : 18,588.30 = 5,370.60 : x
  2. Step 2: Convert to fraction form
    12,390.60/18,588.30 = 5,370.60/x
  3. Step 3: Cross multiply
    12,390.60x = 18,588.30 × 5,370.60
  4. Step 4: Simplify right side
    12,390.60x = 99,830,323.98
  5. Step 5: Solve for x
    x = 99,830,323.98/12,390.60
  6. Step 6: Final answer
    x = 8,056.94

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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.