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Finding the Fourth Proportional to 650.90, 898.28 and 388.91

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Solution

The fourth proportional to 650.90, 898.28 and 388.91 is: 536.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    650.90 : 898.28 = 388.91 : x
  2. Step 2: Convert to fraction form
    650.90/898.28 = 388.91/x
  3. Step 3: Cross multiply
    650.90x = 898.28 × 388.91
  4. Step 4: Simplify right side
    650.90x = 349,350.07
  5. Step 5: Solve for x
    x = 349,350.07/650.90
  6. Step 6: Final answer
    x = 536.72

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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.