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Finding the Fourth Proportional to 76,425.40, 114,638.10 and 21,021.40

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Solution

The fourth proportional to 76,425.40, 114,638.10 and 21,021.40 is: 31,532.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,425.40 : 114,638.10 = 21,021.40 : x
  2. Step 2: Convert to fraction form
    76,425.40/114,638.10 = 21,021.40/x
  3. Step 3: Cross multiply
    76,425.40x = 114,638.10 × 21,021.40
  4. Step 4: Simplify right side
    76,425.40x = 2,409,853,355.34
  5. Step 5: Solve for x
    x = 2,409,853,355.34/76,425.40
  6. Step 6: Final answer
    x = 31,532.10

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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.