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Finding the Fourth Proportional to 651.20, 898.82 and 389.18

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Solution

The fourth proportional to 651.20, 898.82 and 389.18 is: 537.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.20 : 898.82 = 389.18 : x
  2. Step 2: Convert to fraction form
    651.20/898.82 = 389.18/x
  3. Step 3: Cross multiply
    651.20x = 898.82 × 389.18
  4. Step 4: Simplify right side
    651.20x = 349,802.77
  5. Step 5: Solve for x
    x = 349,802.77/651.20
  6. Step 6: Final answer
    x = 537.17

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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.