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Finding the Fourth Proportional to 18,956.88, 28,430.16 and 7,866.72

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Solution

The fourth proportional to 18,956.88, 28,430.16 and 7,866.72 is: 11,797.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.88 : 28,430.16 = 7,866.72 : x
  2. Step 2: Convert to fraction form
    18,956.88/28,430.16 = 7,866.72/x
  3. Step 3: Cross multiply
    18,956.88x = 28,430.16 × 7,866.72
  4. Step 4: Simplify right side
    18,956.88x = 223,652,108.28
  5. Step 5: Solve for x
    x = 223,652,108.28/18,956.88
  6. Step 6: Final answer
    x = 11,797.94

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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.