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Finding the Fourth Proportional to 651.15, 898.61 and 389.32

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Solution

The fourth proportional to 651.15, 898.61 and 389.32 is: 537.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.15 : 898.61 = 389.32 : x
  2. Step 2: Convert to fraction form
    651.15/898.61 = 389.32/x
  3. Step 3: Cross multiply
    651.15x = 898.61 × 389.32
  4. Step 4: Simplify right side
    651.15x = 349,842.65
  5. Step 5: Solve for x
    x = 349,842.65/651.15
  6. Step 6: Final answer
    x = 537.27

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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.