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Finding the Fourth Proportional to 18,985.20, 28,477.80 and 8,455.20

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Solution

The fourth proportional to 18,985.20, 28,477.80 and 8,455.20 is: 12,682.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.20 : 28,477.80 = 8,455.20 : x
  2. Step 2: Convert to fraction form
    18,985.20/28,477.80 = 8,455.20/x
  3. Step 3: Cross multiply
    18,985.20x = 28,477.80 × 8,455.20
  4. Step 4: Simplify right side
    18,985.20x = 240,785,494.56
  5. Step 5: Solve for x
    x = 240,785,494.56/18,985.20
  6. Step 6: Final answer
    x = 12,682.80

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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.