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Finding the Fourth Proportional to 675.56, 1,011.65 and 431.34

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Solution

The fourth proportional to 675.56, 1,011.65 and 431.34 is: 645.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.56 : 1,011.65 = 431.34 : x
  2. Step 2: Convert to fraction form
    675.56/1,011.65 = 431.34/x
  3. Step 3: Cross multiply
    675.56x = 1,011.65 × 431.34
  4. Step 4: Simplify right side
    675.56x = 436,362.95
  5. Step 5: Solve for x
    x = 436,362.95/675.56
  6. Step 6: Final answer
    x = 645.93

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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.