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Finding the Fourth Proportional to 903.18, 1,245.63 and 553.74

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Solution

The fourth proportional to 903.18, 1,245.63 and 553.74 is: 763.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.18 : 1,245.63 = 553.74 : x
  2. Step 2: Convert to fraction form
    903.18/1,245.63 = 553.74/x
  3. Step 3: Cross multiply
    903.18x = 1,245.63 × 553.74
  4. Step 4: Simplify right side
    903.18x = 689,755.16
  5. Step 5: Solve for x
    x = 689,755.16/903.18
  6. Step 6: Final answer
    x = 763.70

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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.