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Finding the Fourth Proportional to 28,644.72, 42,956.80 and 9,919.68

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Solution

The fourth proportional to 28,644.72, 42,956.80 and 9,919.68 is: 14,875.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,644.72 : 42,956.80 = 9,919.68 : x
  2. Step 2: Convert to fraction form
    28,644.72/42,956.80 = 9,919.68/x
  3. Step 3: Cross multiply
    28,644.72x = 42,956.80 × 9,919.68
  4. Step 4: Simplify right side
    28,644.72x = 426,117,709.82
  5. Step 5: Solve for x
    x = 426,117,709.82/28,644.72
  6. Step 6: Final answer
    x = 14,875.96

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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.