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Finding the Fourth Proportional to 312,911.28, 432,174 and 212,134.32

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Solution

The fourth proportional to 312,911.28, 432,174 and 212,134.32 is: 292,987.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,911.28 : 432,174 = 212,134.32 : x
  2. Step 2: Convert to fraction form
    312,911.28/432,174 = 212,134.32/x
  3. Step 3: Cross multiply
    312,911.28x = 432,174 × 212,134.32
  4. Step 4: Simplify right side
    312,911.28x = 91,678,937,611.68
  5. Step 5: Solve for x
    x = 91,678,937,611.68/312,911.28
  6. Step 6: Final answer
    x = 292,987.00

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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.