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Finding the Fourth Proportional to 903.88, 1,247.35 and 489.88

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Solution

The fourth proportional to 903.88, 1,247.35 and 489.88 is: 676.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.88 : 1,247.35 = 489.88 : x
  2. Step 2: Convert to fraction form
    903.88/1,247.35 = 489.88/x
  3. Step 3: Cross multiply
    903.88x = 1,247.35 × 489.88
  4. Step 4: Simplify right side
    903.88x = 611,045.58
  5. Step 5: Solve for x
    x = 611,045.58/903.88
  6. Step 6: Final answer
    x = 676.03

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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.