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Finding the Fourth Proportional to 20,385.68, 30,579.93 and 7,904.93

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Solution

The fourth proportional to 20,385.68, 30,579.93 and 7,904.93 is: 11,857.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.68 : 30,579.93 = 7,904.93 : x
  2. Step 2: Convert to fraction form
    20,385.68/30,579.93 = 7,904.93/x
  3. Step 3: Cross multiply
    20,385.68x = 30,579.93 × 7,904.93
  4. Step 4: Simplify right side
    20,385.68x = 241,732,053.16
  5. Step 5: Solve for x
    x = 241,732,053.16/20,385.68
  6. Step 6: Final answer
    x = 11,857.94

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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.