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Finding the Fourth Proportional to 38,455.92, 53,070.12 and 21,690

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Solution

The fourth proportional to 38,455.92, 53,070.12 and 21,690 is: 29,932.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,455.92 : 53,070.12 = 21,690 : x
  2. Step 2: Convert to fraction form
    38,455.92/53,070.12 = 21,690/x
  3. Step 3: Cross multiply
    38,455.92x = 53,070.12 × 21,690
  4. Step 4: Simplify right side
    38,455.92x = 1,151,090,902.80
  5. Step 5: Solve for x
    x = 1,151,090,902.80/38,455.92
  6. Step 6: Final answer
    x = 29,932.74

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.