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Finding the Fourth Proportional to 12,291.85, 18,437.78 and 9,815.07

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Solution

The fourth proportional to 12,291.85, 18,437.78 and 9,815.07 is: 14,722.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,291.85 : 18,437.78 = 9,815.07 : x
  2. Step 2: Convert to fraction form
    12,291.85/18,437.78 = 9,815.07/x
  3. Step 3: Cross multiply
    12,291.85x = 18,437.78 × 9,815.07
  4. Step 4: Simplify right side
    12,291.85x = 180,968,139.81
  5. Step 5: Solve for x
    x = 180,968,139.81/12,291.85
  6. Step 6: Final answer
    x = 14,722.61

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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.