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Finding the Fourth Proportional to 286,698.60, 429,918.30 and 128,845.80

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Solution

The fourth proportional to 286,698.60, 429,918.30 and 128,845.80 is: 193,210.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,698.60 : 429,918.30 = 128,845.80 : x
  2. Step 2: Convert to fraction form
    286,698.60/429,918.30 = 128,845.80/x
  3. Step 3: Cross multiply
    286,698.60x = 429,918.30 × 128,845.80
  4. Step 4: Simplify right side
    286,698.60x = 55,393,167,298.14
  5. Step 5: Solve for x
    x = 55,393,167,298.14/286,698.60
  6. Step 6: Final answer
    x = 193,210.46

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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.