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Finding the Fourth Proportional to 72,666.60, 109,016.10 and 28,289.40

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Solution

The fourth proportional to 72,666.60, 109,016.10 and 28,289.40 is: 42,440.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,666.60 : 109,016.10 = 28,289.40 : x
  2. Step 2: Convert to fraction form
    72,666.60/109,016.10 = 28,289.40/x
  3. Step 3: Cross multiply
    72,666.60x = 109,016.10 × 28,289.40
  4. Step 4: Simplify right side
    72,666.60x = 3,084,000,059.34
  5. Step 5: Solve for x
    x = 3,084,000,059.34/72,666.60
  6. Step 6: Final answer
    x = 42,440.41

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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.