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Finding the Fourth Proportional to 858,891.80, 1,288,337.70 and 785,408.60

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Solution

The fourth proportional to 858,891.80, 1,288,337.70 and 785,408.60 is: 1,178,112.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,891.80 : 1,288,337.70 = 785,408.60 : x
  2. Step 2: Convert to fraction form
    858,891.80/1,288,337.70 = 785,408.60/x
  3. Step 3: Cross multiply
    858,891.80x = 1,288,337.70 × 785,408.60
  4. Step 4: Simplify right side
    858,891.80x = 1,011,871,509,284.22
  5. Step 5: Solve for x
    x = 1,011,871,509,284.22/858,891.80
  6. Step 6: Final answer
    x = 1,178,112.90

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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.