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Finding the Fourth Proportional to 859,892.60, 1,289,838.90 and 661,215.80

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Solution

The fourth proportional to 859,892.60, 1,289,838.90 and 661,215.80 is: 991,823.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,892.60 : 1,289,838.90 = 661,215.80 : x
  2. Step 2: Convert to fraction form
    859,892.60/1,289,838.90 = 661,215.80/x
  3. Step 3: Cross multiply
    859,892.60x = 1,289,838.90 × 661,215.80
  4. Step 4: Simplify right side
    859,892.60x = 852,861,860,134.62
  5. Step 5: Solve for x
    x = 852,861,860,134.62/859,892.60
  6. Step 6: Final answer
    x = 991,823.70

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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.