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Finding the Fourth Proportional to 286,692.60, 429,909.30 and 128,839.80

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Solution

The fourth proportional to 286,692.60, 429,909.30 and 128,839.80 is: 193,201.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,692.60 : 429,909.30 = 128,839.80 : x
  2. Step 2: Convert to fraction form
    286,692.60/429,909.30 = 128,839.80/x
  3. Step 3: Cross multiply
    286,692.60x = 429,909.30 × 128,839.80
  4. Step 4: Simplify right side
    286,692.60x = 55,389,428,230.14
  5. Step 5: Solve for x
    x = 55,389,428,230.14/286,692.60
  6. Step 6: Final answer
    x = 193,201.46

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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.