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Finding the Fourth Proportional to 81,607.76, 122,378.88 and 25,429.40

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Solution

The fourth proportional to 81,607.76, 122,378.88 and 25,429.40 is: 38,133.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,607.76 : 122,378.88 = 25,429.40 : x
  2. Step 2: Convert to fraction form
    81,607.76/122,378.88 = 25,429.40/x
  3. Step 3: Cross multiply
    81,607.76x = 122,378.88 × 25,429.40
  4. Step 4: Simplify right side
    81,607.76x = 3,112,021,491.07
  5. Step 5: Solve for x
    x = 3,112,021,491.07/81,607.76
  6. Step 6: Final answer
    x = 38,133.89

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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.