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Finding the Fourth Proportional to 286,667.30, 429,891.60 and 86,921.30

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Solution

The fourth proportional to 286,667.30, 429,891.60 and 86,921.30 is: 130,348.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,667.30 : 429,891.60 = 86,921.30 : x
  2. Step 2: Convert to fraction form
    286,667.30/429,891.60 = 86,921.30/x
  3. Step 3: Cross multiply
    286,667.30x = 429,891.60 × 86,921.30
  4. Step 4: Simplify right side
    286,667.30x = 37,366,736,731.08
  5. Step 5: Solve for x
    x = 37,366,736,731.08/286,667.30
  6. Step 6: Final answer
    x = 130,348.79

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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.