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Finding the Fourth Proportional to 689,643.39, 951,692.94 and 399,267.20

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Solution

The fourth proportional to 689,643.39, 951,692.94 and 399,267.20 is: 550,980.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,643.39 : 951,692.94 = 399,267.20 : x
  2. Step 2: Convert to fraction form
    689,643.39/951,692.94 = 399,267.20/x
  3. Step 3: Cross multiply
    689,643.39x = 951,692.94 × 399,267.20
  4. Step 4: Simplify right side
    689,643.39x = 379,979,770,655.10
  5. Step 5: Solve for x
    x = 379,979,770,655.10/689,643.39
  6. Step 6: Final answer
    x = 550,980.08

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1.5x scale

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.