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Finding the Fourth Proportional to 72,688.80, 109,000.80 and 28,300.80

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Solution

The fourth proportional to 72,688.80, 109,000.80 and 28,300.80 is: 42,438.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,688.80 : 109,000.80 = 28,300.80 : x
  2. Step 2: Convert to fraction form
    72,688.80/109,000.80 = 28,300.80/x
  3. Step 3: Cross multiply
    72,688.80x = 109,000.80 × 28,300.80
  4. Step 4: Simplify right side
    72,688.80x = 3,084,809,840.64
  5. Step 5: Solve for x
    x = 3,084,809,840.64/72,688.80
  6. Step 6: Final answer
    x = 42,438.59

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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.