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Finding the Fourth Proportional to 12,555.52, 18,825.96 and 8,655.40

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Solution

The fourth proportional to 12,555.52, 18,825.96 and 8,655.40 is: 12,978.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,555.52 : 18,825.96 = 8,655.40 : x
  2. Step 2: Convert to fraction form
    12,555.52/18,825.96 = 8,655.40/x
  3. Step 3: Cross multiply
    12,555.52x = 18,825.96 × 8,655.40
  4. Step 4: Simplify right side
    12,555.52x = 162,946,214.18
  5. Step 5: Solve for x
    x = 162,946,214.18/12,555.52
  6. Step 6: Final answer
    x = 12,978.05

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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.