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Finding the Fourth Proportional to 903.83, 1,247.28 and 489.83

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Solution

The fourth proportional to 903.83, 1,247.28 and 489.83 is: 675.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.83 : 1,247.28 = 489.83 : x
  2. Step 2: Convert to fraction form
    903.83/1,247.28 = 489.83/x
  3. Step 3: Cross multiply
    903.83x = 1,247.28 × 489.83
  4. Step 4: Simplify right side
    903.83x = 610,955.16
  5. Step 5: Solve for x
    x = 610,955.16/903.83
  6. Step 6: Final answer
    x = 675.96

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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.