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Finding the Fourth Proportional to 18,303.75, 25,259.18 and 9,920.25

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Solution

The fourth proportional to 18,303.75, 25,259.18 and 9,920.25 is: 13,689.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,303.75 : 25,259.18 = 9,920.25 : x
  2. Step 2: Convert to fraction form
    18,303.75/25,259.18 = 9,920.25/x
  3. Step 3: Cross multiply
    18,303.75x = 25,259.18 × 9,920.25
  4. Step 4: Simplify right side
    18,303.75x = 250,577,380.40
  5. Step 5: Solve for x
    x = 250,577,380.40/18,303.75
  6. Step 6: Final answer
    x = 13,689.95

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Half scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.