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Finding the Fourth Proportional to 120,908.40, 181,143.90 and 103,412.40

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Solution

The fourth proportional to 120,908.40, 181,143.90 and 103,412.40 is: 154,931.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,908.40 : 181,143.90 = 103,412.40 : x
  2. Step 2: Convert to fraction form
    120,908.40/181,143.90 = 103,412.40/x
  3. Step 3: Cross multiply
    120,908.40x = 181,143.90 × 103,412.40
  4. Step 4: Simplify right side
    120,908.40x = 18,732,525,444.36
  5. Step 5: Solve for x
    x = 18,732,525,444.36/120,908.40
  6. Step 6: Final answer
    x = 154,931.55

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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.