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Finding the Fourth Proportional to 900.46, 1,351.86 and 645.58

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Solution

The fourth proportional to 900.46, 1,351.86 and 645.58 is: 969.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.46 : 1,351.86 = 645.58 : x
  2. Step 2: Convert to fraction form
    900.46/1,351.86 = 645.58/x
  3. Step 3: Cross multiply
    900.46x = 1,351.86 × 645.58
  4. Step 4: Simplify right side
    900.46x = 872,733.78
  5. Step 5: Solve for x
    x = 872,733.78/900.46
  6. Step 6: Final answer
    x = 969.21

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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.