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Finding the Fourth Proportional to 124,428.70, 186,205.65 and 86,812.30

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Solution

The fourth proportional to 124,428.70, 186,205.65 and 86,812.30 is: 129,913.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,428.70 : 186,205.65 = 86,812.30 : x
  2. Step 2: Convert to fraction form
    124,428.70/186,205.65 = 86,812.30/x
  3. Step 3: Cross multiply
    124,428.70x = 186,205.65 × 86,812.30
  4. Step 4: Simplify right side
    124,428.70x = 16,164,940,749.50
  5. Step 5: Solve for x
    x = 16,164,940,749.50/124,428.70
  6. Step 6: Final answer
    x = 129,913.28

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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.