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Finding the Fourth Proportional to 651.28, 898.84 and 399.18

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Solution

The fourth proportional to 651.28, 898.84 and 399.18 is: 550.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.28 : 898.84 = 399.18 : x
  2. Step 2: Convert to fraction form
    651.28/898.84 = 399.18/x
  3. Step 3: Cross multiply
    651.28x = 898.84 × 399.18
  4. Step 4: Simplify right side
    651.28x = 358,798.95
  5. Step 5: Solve for x
    x = 358,798.95/651.28
  6. Step 6: Final answer
    x = 550.91

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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.