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Finding the Fourth Proportional to 12,443.59, 18,621.53 and 7,765.79

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Solution

The fourth proportional to 12,443.59, 18,621.53 and 7,765.79 is: 11,621.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,443.59 : 18,621.53 = 7,765.79 : x
  2. Step 2: Convert to fraction form
    12,443.59/18,621.53 = 7,765.79/x
  3. Step 3: Cross multiply
    12,443.59x = 18,621.53 × 7,765.79
  4. Step 4: Simplify right side
    12,443.59x = 144,610,941.38
  5. Step 5: Solve for x
    x = 144,610,941.38/12,443.59
  6. Step 6: Final answer
    x = 11,621.32

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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.