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Finding the Fourth Proportional to 38,455.89, 53,069.10 and 21,688.89

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Solution

The fourth proportional to 38,455.89, 53,069.10 and 21,688.89 is: 29,930.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,455.89 : 53,069.10 = 21,688.89 : x
  2. Step 2: Convert to fraction form
    38,455.89/53,069.10 = 21,688.89/x
  3. Step 3: Cross multiply
    38,455.89x = 53,069.10 × 21,688.89
  4. Step 4: Simplify right side
    38,455.89x = 1,151,009,872.30
  5. Step 5: Solve for x
    x = 1,151,009,872.30/38,455.89
  6. Step 6: Final answer
    x = 29,930.65

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1.5x scale

Why These Related Problems?

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