Home / 81,870.12-122,863.50-35,136.36

Finding the Fourth Proportional to 81,870.12, 122,863.50 and 35,136.36

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Solution

The fourth proportional to 81,870.12, 122,863.50 and 35,136.36 is: 52,729.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,870.12 : 122,863.50 = 35,136.36 : x
  2. Step 2: Convert to fraction form
    81,870.12/122,863.50 = 35,136.36/x
  3. Step 3: Cross multiply
    81,870.12x = 122,863.50 × 35,136.36
  4. Step 4: Simplify right side
    81,870.12x = 4,316,976,166.86
  5. Step 5: Solve for x
    x = 4,316,976,166.86/81,870.12
  6. Step 6: Final answer
    x = 52,729.57

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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.