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Finding the Fourth Proportional to 18,657.60, 27,985.80 and 6,178.20

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Solution

The fourth proportional to 18,657.60, 27,985.80 and 6,178.20 is: 9,267.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,657.60 : 27,985.80 = 6,178.20 : x
  2. Step 2: Convert to fraction form
    18,657.60/27,985.80 = 6,178.20/x
  3. Step 3: Cross multiply
    18,657.60x = 27,985.80 × 6,178.20
  4. Step 4: Simplify right side
    18,657.60x = 172,901,869.56
  5. Step 5: Solve for x
    x = 172,901,869.56/18,657.60
  6. Step 6: Final answer
    x = 9,267.10

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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.