Home / 91,081.20-136,621.80-85,176.30

Finding the Fourth Proportional to 91,081.20, 136,621.80 and 85,176.30

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Solution

The fourth proportional to 91,081.20, 136,621.80 and 85,176.30 is: 127,764.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,081.20 : 136,621.80 = 85,176.30 : x
  2. Step 2: Convert to fraction form
    91,081.20/136,621.80 = 85,176.30/x
  3. Step 3: Cross multiply
    91,081.20x = 136,621.80 × 85,176.30
  4. Step 4: Simplify right side
    91,081.20x = 11,636,939,423.34
  5. Step 5: Solve for x
    x = 11,636,939,423.34/91,081.20
  6. Step 6: Final answer
    x = 127,764.45

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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.