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Finding the Fourth Proportional to 85,606.70, 128,410.05 and 76,421.30

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Solution

The fourth proportional to 85,606.70, 128,410.05 and 76,421.30 is: 114,631.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,606.70 : 128,410.05 = 76,421.30 : x
  2. Step 2: Convert to fraction form
    85,606.70/128,410.05 = 76,421.30/x
  3. Step 3: Cross multiply
    85,606.70x = 128,410.05 × 76,421.30
  4. Step 4: Simplify right side
    85,606.70x = 9,813,262,954.07
  5. Step 5: Solve for x
    x = 9,813,262,954.07/85,606.70
  6. Step 6: Final answer
    x = 114,631.95

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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.