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Finding the Fourth Proportional to 103,139.40, 154,709.10 and 76,895.40

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Solution

The fourth proportional to 103,139.40, 154,709.10 and 76,895.40 is: 115,343.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,139.40 : 154,709.10 = 76,895.40 : x
  2. Step 2: Convert to fraction form
    103,139.40/154,709.10 = 76,895.40/x
  3. Step 3: Cross multiply
    103,139.40x = 154,709.10 × 76,895.40
  4. Step 4: Simplify right side
    103,139.40x = 11,896,418,128.14
  5. Step 5: Solve for x
    x = 11,896,418,128.14/103,139.40
  6. Step 6: Final answer
    x = 115,343.10

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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.