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Finding the Fourth Proportional to 137,048.60, 205,443.30 and 80,931.80

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Solution

The fourth proportional to 137,048.60, 205,443.30 and 80,931.80 is: 121,321.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,048.60 : 205,443.30 = 80,931.80 : x
  2. Step 2: Convert to fraction form
    137,048.60/205,443.30 = 80,931.80/x
  3. Step 3: Cross multiply
    137,048.60x = 205,443.30 × 80,931.80
  4. Step 4: Simplify right side
    137,048.60x = 16,626,896,066.94
  5. Step 5: Solve for x
    x = 16,626,896,066.94/137,048.60
  6. Step 6: Final answer
    x = 121,321.17

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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.