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Finding the Fourth Proportional to 18,988.56, 28,486.08 and 8,462.40

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Solution

The fourth proportional to 18,988.56, 28,486.08 and 8,462.40 is: 12,695.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.56 : 28,486.08 = 8,462.40 : x
  2. Step 2: Convert to fraction form
    18,988.56/28,486.08 = 8,462.40/x
  3. Step 3: Cross multiply
    18,988.56x = 28,486.08 × 8,462.40
  4. Step 4: Simplify right side
    18,988.56x = 241,060,603.39
  5. Step 5: Solve for x
    x = 241,060,603.39/18,988.56
  6. Step 6: Final answer
    x = 12,695.04

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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.