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Finding the Fourth Proportional to 286,720.80, 429,971.85 and 86,974.80

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Solution

The fourth proportional to 286,720.80, 429,971.85 and 86,974.80 is: 130,429.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,720.80 : 429,971.85 = 86,974.80 : x
  2. Step 2: Convert to fraction form
    286,720.80/429,971.85 = 86,974.80/x
  3. Step 3: Cross multiply
    286,720.80x = 429,971.85 × 86,974.80
  4. Step 4: Simplify right side
    286,720.80x = 37,396,715,659.38
  5. Step 5: Solve for x
    x = 37,396,715,659.38/286,720.80
  6. Step 6: Final answer
    x = 130,429.03

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1.5x scale

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.