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Finding the Fourth Proportional to 553.95, 763.61 and 357.21

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Solution

The fourth proportional to 553.95, 763.61 and 357.21 is: 492.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.95 : 763.61 = 357.21 : x
  2. Step 2: Convert to fraction form
    553.95/763.61 = 357.21/x
  3. Step 3: Cross multiply
    553.95x = 763.61 × 357.21
  4. Step 4: Simplify right side
    553.95x = 272,767.34
  5. Step 5: Solve for x
    x = 272,767.34/553.95
  6. Step 6: Final answer
    x = 492.40

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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.