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Finding the Fourth Proportional to 81,980.35, 122,970.55 and 63,287.67

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Solution

The fourth proportional to 81,980.35, 122,970.55 and 63,287.67 is: 94,931.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,980.35 : 122,970.55 = 63,287.67 : x
  2. Step 2: Convert to fraction form
    81,980.35/122,970.55 = 63,287.67/x
  3. Step 3: Cross multiply
    81,980.35x = 122,970.55 × 63,287.67
  4. Step 4: Simplify right side
    81,980.35x = 7,782,519,588.12
  5. Step 5: Solve for x
    x = 7,782,519,588.12/81,980.35
  6. Step 6: Final answer
    x = 94,931.52

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1.5x scale

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.