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Finding the Fourth Proportional to 80,602.80, 120,746.54 and 66,391.67

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Solution

The fourth proportional to 80,602.80, 120,746.54 and 66,391.67 is: 99,457.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,602.80 : 120,746.54 = 66,391.67 : x
  2. Step 2: Convert to fraction form
    80,602.80/120,746.54 = 66,391.67/x
  3. Step 3: Cross multiply
    80,602.80x = 120,746.54 × 66,391.67
  4. Step 4: Simplify right side
    80,602.80x = 8,016,564,437.32
  5. Step 5: Solve for x
    x = 8,016,564,437.32/80,602.80
  6. Step 6: Final answer
    x = 99,457.64

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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.