Home / 91,029.80-136,544.70-78,345.20

Finding the Fourth Proportional to 91,029.80, 136,544.70 and 78,345.20

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Solution

The fourth proportional to 91,029.80, 136,544.70 and 78,345.20 is: 117,517.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,029.80 : 136,544.70 = 78,345.20 : x
  2. Step 2: Convert to fraction form
    91,029.80/136,544.70 = 78,345.20/x
  3. Step 3: Cross multiply
    91,029.80x = 136,544.70 × 78,345.20
  4. Step 4: Simplify right side
    91,029.80x = 10,697,621,830.44
  5. Step 5: Solve for x
    x = 10,697,621,830.44/91,029.80
  6. Step 6: Final answer
    x = 117,517.80

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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.