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Finding the Fourth Proportional to 21,618.72, 32,415.08 and 8,455.40

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Solution

The fourth proportional to 21,618.72, 32,415.08 and 8,455.40 is: 12,678.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,618.72 : 32,415.08 = 8,455.40 : x
  2. Step 2: Convert to fraction form
    21,618.72/32,415.08 = 8,455.40/x
  3. Step 3: Cross multiply
    21,618.72x = 32,415.08 × 8,455.40
  4. Step 4: Simplify right side
    21,618.72x = 274,082,467.43
  5. Step 5: Solve for x
    x = 274,082,467.43/21,618.72
  6. Step 6: Final answer
    x = 12,678.02

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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.