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Finding the Fourth Proportional to 12,323.80, 18,485.70 and 7,390.90

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Solution

The fourth proportional to 12,323.80, 18,485.70 and 7,390.90 is: 11,086.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,323.80 : 18,485.70 = 7,390.90 : x
  2. Step 2: Convert to fraction form
    12,323.80/18,485.70 = 7,390.90/x
  3. Step 3: Cross multiply
    12,323.80x = 18,485.70 × 7,390.90
  4. Step 4: Simplify right side
    12,323.80x = 136,625,960.13
  5. Step 5: Solve for x
    x = 136,625,960.13/12,323.80
  6. Step 6: Final answer
    x = 11,086.35

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Similar ratio
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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.