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Finding the Fourth Proportional to 18,686.60, 28,005.02 and 6,988.04

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Solution

The fourth proportional to 18,686.60, 28,005.02 and 6,988.04 is: 10,472.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.60 : 28,005.02 = 6,988.04 : x
  2. Step 2: Convert to fraction form
    18,686.60/28,005.02 = 6,988.04/x
  3. Step 3: Cross multiply
    18,686.60x = 28,005.02 × 6,988.04
  4. Step 4: Simplify right side
    18,686.60x = 195,700,199.96
  5. Step 5: Solve for x
    x = 195,700,199.96/18,686.60
  6. Step 6: Final answer
    x = 10,472.76

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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.