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Finding the Fourth Proportional to 553.71, 764.85 and 388.47

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Solution

The fourth proportional to 553.71, 764.85 and 388.47 is: 536.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.71 : 764.85 = 388.47 : x
  2. Step 2: Convert to fraction form
    553.71/764.85 = 388.47/x
  3. Step 3: Cross multiply
    553.71x = 764.85 × 388.47
  4. Step 4: Simplify right side
    553.71x = 297,117.46
  5. Step 5: Solve for x
    x = 297,117.46/553.71
  6. Step 6: Final answer
    x = 536.60

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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.