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Finding the Fourth Proportional to 906.45, 1,250.90 and 492.45

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Solution

The fourth proportional to 906.45, 1,250.90 and 492.45 is: 679.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.45 : 1,250.90 = 492.45 : x
  2. Step 2: Convert to fraction form
    906.45/1,250.90 = 492.45/x
  3. Step 3: Cross multiply
    906.45x = 1,250.90 × 492.45
  4. Step 4: Simplify right side
    906.45x = 616,005.71
  5. Step 5: Solve for x
    x = 616,005.71/906.45
  6. Step 6: Final answer
    x = 679.58

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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.