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Finding the Fourth Proportional to 772,692.54, 1,066,379.54 and 428,639.40

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Solution

The fourth proportional to 772,692.54, 1,066,379.54 and 428,639.40 is: 591,557.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    772,692.54 : 1,066,379.54 = 428,639.40 : x
  2. Step 2: Convert to fraction form
    772,692.54/1,066,379.54 = 428,639.40/x
  3. Step 3: Cross multiply
    772,692.54x = 1,066,379.54 × 428,639.40
  4. Step 4: Simplify right side
    772,692.54x = 457,092,286,197.88
  5. Step 5: Solve for x
    x = 457,092,286,197.88/772,692.54
  6. Step 6: Final answer
    x = 591,557.78

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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.