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Finding the Fourth Proportional to 13,655.60, 18,849.24 and 8,620.40

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Solution

The fourth proportional to 13,655.60, 18,849.24 and 8,620.40 is: 11,899.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,655.60 : 18,849.24 = 8,620.40 : x
  2. Step 2: Convert to fraction form
    13,655.60/18,849.24 = 8,620.40/x
  3. Step 3: Cross multiply
    13,655.60x = 18,849.24 × 8,620.40
  4. Step 4: Simplify right side
    13,655.60x = 162,487,988.50
  5. Step 5: Solve for x
    x = 162,487,988.50/13,655.60
  6. Step 6: Final answer
    x = 11,899.00

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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.