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Finding the Fourth Proportional to 123,579.40, 185,369.10 and 71,091.40

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Solution

The fourth proportional to 123,579.40, 185,369.10 and 71,091.40 is: 106,637.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,579.40 : 185,369.10 = 71,091.40 : x
  2. Step 2: Convert to fraction form
    123,579.40/185,369.10 = 71,091.40/x
  3. Step 3: Cross multiply
    123,579.40x = 185,369.10 × 71,091.40
  4. Step 4: Simplify right side
    123,579.40x = 13,178,148,835.74
  5. Step 5: Solve for x
    x = 13,178,148,835.74/123,579.40
  6. Step 6: Final answer
    x = 106,637.10

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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.