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Finding the Fourth Proportional to 708,983.67, 978,396.87 and 386,692.77

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Solution

The fourth proportional to 708,983.67, 978,396.87 and 386,692.77 is: 533,635.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,983.67 : 978,396.87 = 386,692.77 : x
  2. Step 2: Convert to fraction form
    708,983.67/978,396.87 = 386,692.77/x
  3. Step 3: Cross multiply
    708,983.67x = 978,396.87 × 386,692.77
  4. Step 4: Simplify right side
    708,983.67x = 378,338,995,819.63
  5. Step 5: Solve for x
    x = 378,338,995,819.63/708,983.67
  6. Step 6: Final answer
    x = 533,635.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.