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Finding the Fourth Proportional to 903.05, 1,246.20 and 489.05

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Solution

The fourth proportional to 903.05, 1,246.20 and 489.05 is: 674.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.05 : 1,246.20 = 489.05 : x
  2. Step 2: Convert to fraction form
    903.05/1,246.20 = 489.05/x
  3. Step 3: Cross multiply
    903.05x = 1,246.20 × 489.05
  4. Step 4: Simplify right side
    903.05x = 609,454.11
  5. Step 5: Solve for x
    x = 609,454.11/903.05
  6. Step 6: Final answer
    x = 674.88

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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.