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Finding the Fourth Proportional to 12,666.20, 18,999.28 and 3,432.20

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Solution

The fourth proportional to 12,666.20, 18,999.28 and 3,432.20 is: 5,148.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,666.20 : 18,999.28 = 3,432.20 : x
  2. Step 2: Convert to fraction form
    12,666.20/18,999.28 = 3,432.20/x
  3. Step 3: Cross multiply
    12,666.20x = 18,999.28 × 3,432.20
  4. Step 4: Simplify right side
    12,666.20x = 65,209,328.82
  5. Step 5: Solve for x
    x = 65,209,328.82/12,666.20
  6. Step 6: Final answer
    x = 5,148.29

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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.