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Finding the Fourth Proportional to 859,693.80, 1,289,540.70 and 786,210.60

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Solution

The fourth proportional to 859,693.80, 1,289,540.70 and 786,210.60 is: 1,179,315.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,693.80 : 1,289,540.70 = 786,210.60 : x
  2. Step 2: Convert to fraction form
    859,693.80/1,289,540.70 = 786,210.60/x
  3. Step 3: Cross multiply
    859,693.80x = 1,289,540.70 × 786,210.60
  4. Step 4: Simplify right side
    859,693.80x = 1,013,850,567,471.42
  5. Step 5: Solve for x
    x = 1,013,850,567,471.42/859,693.80
  6. Step 6: Final answer
    x = 1,179,315.90

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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.