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Finding the Fourth Proportional to 137,246.80, 205,870.20 and 81,113.80

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Solution

The fourth proportional to 137,246.80, 205,870.20 and 81,113.80 is: 121,670.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,246.80 : 205,870.20 = 81,113.80 : x
  2. Step 2: Convert to fraction form
    137,246.80/205,870.20 = 81,113.80/x
  3. Step 3: Cross multiply
    137,246.80x = 205,870.20 × 81,113.80
  4. Step 4: Simplify right side
    137,246.80x = 16,698,914,228.76
  5. Step 5: Solve for x
    x = 16,698,914,228.76/137,246.80
  6. Step 6: Final answer
    x = 121,670.70

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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.