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Finding the Fourth Proportional to 72,666.20, 108,999.30 and 68,583.80

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Solution

The fourth proportional to 72,666.20, 108,999.30 and 68,583.80 is: 102,875.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,666.20 : 108,999.30 = 68,583.80 : x
  2. Step 2: Convert to fraction form
    72,666.20/108,999.30 = 68,583.80/x
  3. Step 3: Cross multiply
    72,666.20x = 108,999.30 × 68,583.80
  4. Step 4: Simplify right side
    72,666.20x = 7,475,586,191.34
  5. Step 5: Solve for x
    x = 7,475,586,191.34/72,666.20
  6. Step 6: Final answer
    x = 102,875.70

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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.