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Finding the Fourth Proportional to 38,889,431.40, 53,667,978.48 and 21,486,176.88

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Solution

The fourth proportional to 38,889,431.40, 53,667,978.48 and 21,486,176.88 is: 29,651,235.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,889,431.40 : 53,667,978.48 = 21,486,176.88 : x
  2. Step 2: Convert to fraction form
    38,889,431.40/53,667,978.48 = 21,486,176.88/x
  3. Step 3: Cross multiply
    38,889,431.40x = 53,667,978.48 × 21,486,176.88
  4. Step 4: Simplify right side
    38,889,431.40x = 1,153,119,678,413,313.50
  5. Step 5: Solve for x
    x = 1,153,119,678,413,313.50/38,889,431.40
  6. Step 6: Final answer
    x = 29,651,235.23

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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.